CVE-2026-24044

CRITICALNVD 9.29.2
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This critical-severity CVE scores 9.2 under NVD CVSS. EPSS exploit probability: 0.3% (26th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS
Sources: EPSS, NVD CVSS

Also known asEUVD-2026-6697 (ENISA EUVD)Source: ENISA EUVD

9.2EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 9.2Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Element Server Suite Community Edition (ESS Community) deploys a Matrix stack using the provided Helm charts and Kubernetes distribution. The ESS Community Helm Chart secrets initialization hook (using matrix-tools container before 0.5.7) is using an insecure Matrix server key generation method, allowing network attackers to potentially recreate the same key pair, allowing them to impersonate the victim server. The secret is generated by the secrets initialization hook, in the ESS Community Helm Chart values, if both initSecrets.enabled is not set to false and synapse.signingKey is not defined. Given a server key in Matrix authenticates both requests originating from and events constructed on a given server, this potentially impacts confidentiality, integrity and availability of rooms which have a vulnerable server present as a member. The confidentiality of past conversations in end-to-end encrypted rooms is not impacted. The key generation issue was fixed in matrix-tools 0.5.7, released as part of ESS Community Helm Chart 25.12.1.

CVSS
9.2
EG Score
9.2CRITICALmedium confidence
EG Risk
42
EG Risk 42/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity92% × 45%
Impact severity (EG Severity): CVSS 9.2 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
26th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.2): severity, escalated by confirmed exploitation. This CVE's 9.2 is its impact severity (EG Severity), not escalated.

EG Severity
9.2 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-11). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

February 12, 2026

Last Modified

June 17, 2026

Advisory Details (3)

Auto-updated Sep 15, 2026
Patch available. Sources: github_release, github.
GitHub advisoryMentions a patch (unverified)

Weak server key generation method · Advisory · element-hq/ess-helm · GitHub

https://github.com/element-hq/ess-helm/security/advisories/GHSA-qwcj-h6m8-vp6q
GitHub release Patch Available

25.12.2

Patch available: element-hq/ess-helm 25.12.2

https://github.com/element-hq/ess-helm/releases/tag/25.12.2
Web page

ess-helm/docs/maintenance.md at main · element-hq/ess-helm · GitHub

https://github.com/element-hq/ess-helm/blob/main/docs/maintenance.md#fixing-cve-2026-24044elementsec-2025-1670-manually

Affected Packages

(2 across 2 ecosystems)
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
synapse—
  • every version up to 1.147.1-r0: fixed in 1.147.1-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
synapse—
  • every version up to 1.147.1-r0: fixed in 1.147.1-r0
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 31× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 265 rows on record for this CVE, as 99 entries (1 repeat merged).

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 165 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-12 16:33 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  2. 2026-11-12 12:29 UTCEchelonGraph re-scored
  3. 2026-11-11 16:39 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  4. 2026-11-11 10:36 UTCEchelonGraph re-scored
  5. 2026-11-10 16:43 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  6. 2026-11-10 08:43 UTCEchelonGraph re-scored
  7. 2026-11-09 16:34 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  8. 2026-11-09 06:49 UTCEchelonGraph re-scored
  9. 2026-11-08 16:38 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  10. 2026-11-08 04:57 UTCEchelonGraph re-scored
  11. 2026-11-07 16:38 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  12. 2026-11-07 03:04 UTCEchelonGraph re-scored
  13. 2026-11-06 16:37 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  14. 2026-11-06 03:25 UTCOSV refresh
  15. 2026-11-06 01:11 UTCEchelonGraph re-scored
  16. 2026-11-05 16:37 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  17. 2026-11-04 23:16 UTCEchelonGraph re-scored
  18. 2026-11-04 16:35 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  19. 2026-11-03 21:22 UTCEchelonGraph re-scored
  20. 2026-11-03 16:47 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  21. 2026-11-02 19:29 UTCEchelonGraph re-scored
  22. 2026-11-02 16:44 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  23. 2026-11-01 17:32 UTCEchelonGraph re-scored
  24. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  25. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.3% · 25th percentile
Show 74 more
  1. 2026-10-31 15:37 UTCEchelonGraph re-scored
  2. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  3. 2026-10-30 13:44 UTCEchelonGraph re-scored
  4. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  5. 2026-10-29 11:38 UTCEchelonGraph re-scored
  6. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  7. 2026-10-28 09:45 UTCEchelonGraph re-scored
  8. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  9. 2026-10-27 07:01 UTCEchelonGraph re-scored
  10. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  11. 2026-10-26 02:00 UTCEchelonGraph re-scored
  12. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  13. 2026-10-25 14:41 UTCEchelonGraph re-scored
  14. 2026-10-25 00:07 UTCEchelonGraph re-scored
  15. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  16. 2026-10-23 22:13 UTCEchelonGraph re-scored
  17. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  18. 2026-10-22 20:20 UTCEchelonGraph re-scored
  19. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  20. 2026-10-21 18:27 UTCEchelonGraph re-scored
  21. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  22. 2026-10-20 16:34 UTCEchelonGraph re-scored
  23. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  24. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  25. 2026-10-19 14:31 UTCEchelonGraph re-scored
  26. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  27. 2026-10-18 03:54 UTCEchelonGraph re-scored
  28. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  29. 2026-10-17 10:41 UTCEchelonGraph re-scored
  30. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  31. 2026-10-16 08:47 UTCEchelonGraph re-scored
  32. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  33. 2026-10-15 06:53 UTCEchelonGraph re-scored
  34. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  35. 2026-10-14 02:38 UTCEchelonGraph re-scored
  36. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  37. 2026-10-12 22:50 UTCEchelonGraph re-scored
  38. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  39. 2026-10-12 16:20 UTCEchelonGraph re-scored
  40. 2026-10-11 20:02 UTCEchelonGraph re-scored
  41. 2026-10-11 17:15 UTCEchelonGraph re-scored
  42. 2026-10-11 14:47 UTCEchelonGraph re-scored
  43. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  44. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  45. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  46. 2026-10-09 08:28 UTCOSV refresh
  47. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  48. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  49. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  50. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  51. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  52. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  53. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  54. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  55. 2026-09-29 15:21 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  56. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  57. 2026-09-27 13:47 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  58. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  59. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  60. 2026-09-24 14:03 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  61. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  62. 2026-09-19 15:33 UTCOSV refresh
  63. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  64. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  65. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  66. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  67. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  68. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  69. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  70. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  71. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  72. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  73. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  74. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.3% · 19th percentile

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Frequently asked(5)

What is CVE-2026-24044?
CVE-2026-24044 is a critical-severity vulnerability; its CVE record was published on February 12, 2026. Element Server Suite Community Edition (ESS Community) deploys a Matrix stack using the provided Helm charts and Kubernetes distribution. The ESS Community Helm Chart secrets initialization hook (using matrix-tools container before 0.5.7) is using an insecure Matrix server key generation method,…
When was the CVE record for CVE-2026-24044 published?
The CVE record for CVE-2026-24044 was published on February 12, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of June 17, 2026; the record at its source may have been updated since.
Is CVE-2026-24044 actively exploited?
CVE-2026-24044 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (26th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-24044?
CVE-2026-24044 has a CVSS base score of 9.2 (NVD).
How do I remediate CVE-2026-24044?
A fix for CVE-2026-24044 is available: update to the fixed version the vendor names in its advisory.

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