CVE-2026-88920

CRITICALPre-NVD 9.89.8
EchelonGraph scoreMEDIUM confidence

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

This critical-severity CVE scores 9.8 under CISA-ADP (Vulnrichment) CVSS v3.1 (NVD's own analysis pending). EPSS exploit probability: 0.6% (48th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from CISA-ADP (Vulnrichment) CVSS v3.1
Sources: CISA-ADP (Vulnrichment) CVSS v3.1, EPSS

Also known asEUVD-2026-89793 (ENISA EUVD) · GHSA-4c9g-74h5-78r7 (GitHub Security Advisories)Source: ENISA EUVD

9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

An authentication bypass in the DOM security processor in Apache WSS4J allows unauthenticated remote attackers to forge authenticated SOAP messages via a crafted unsigned SAML sender-vouches assertion containing an attacker-controlled key.

Users are recommended to upgrade to versions 4.0.2 or 3.0.6 or 2.4.4, which fix this issue.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
59
EG Risk 59/100

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)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.6% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
0.6%
EPSS %ILE
48th
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 (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.CISA-ADP (Vulnrichment) CVSS v3.1 · CVSS v3.1
EG Likelihood
0.6% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). 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; Attend at high (mission-essential systems).CISA BOD 26-04: 3 days if the affected system is publicly exposed; 60 days 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; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (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)3 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (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

September 30, 2026

Last Modified

October 2, 2026

Advisory Details (2)

Auto-updated Nov 8, 2026
Patch available.
Web page

oss-security - CVE-2026-88920: Apache WSS4J: SAML Sender-Vouches Authentication Bypass

http://www.openwall.com/lists/oss-security/2026/09/30/10

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatorg.apache.wss4j/wss4j-ws-security-dom:4.0.2.redhat-000072026-10-15redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
wss4j1.6.19-3, 1.6.19-4
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
wss4j1.6.19-4
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
wss4j1.6.19-4
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 21× in last 7d / 67× 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 v3 → 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 215 rows on record for this CVE.

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. None are among the latest 100 rows. The 115 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 16:58 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  2. 2026-11-13 01:20 UTCEchelonGraph re-scored
  3. 2026-11-13 01:20 UTCVendor advisory
  4. 2026-11-13 01:20 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  5. 2026-11-12 16:35 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  6. 2026-11-12 01:40 UTCEchelonGraph re-scored
  7. 2026-11-12 01:40 UTCVendor advisory
  8. 2026-11-12 01:40 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  9. 2026-11-11 16:41 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  10. 2026-11-11 02:00 UTCEchelonGraph re-scored
  11. 2026-11-11 02:00 UTCVendor advisory
  12. 2026-11-11 02:00 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  13. 2026-11-10 16:45 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  14. 2026-11-10 02:20 UTCEchelonGraph re-scored
  15. 2026-11-10 02:20 UTCVendor advisory
  16. 2026-11-10 02:20 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  17. 2026-11-09 16:36 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  18. 2026-11-09 02:40 UTCEchelonGraph re-scored
  19. 2026-11-09 02:40 UTCVendor advisory
  20. 2026-11-09 02:40 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  21. 2026-11-08 16:41 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  22. 2026-11-08 03:01 UTCEchelonGraph re-scored
  23. 2026-11-08 03:01 UTCVendor advisory
  24. 2026-11-08 03:01 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  25. 2026-11-07 16:40 UTCEPSS rescoreEPSS 0.6% · 48th percentile
Show 75 more
  1. 2026-11-07 03:21 UTCEchelonGraph re-scored
  2. 2026-11-07 03:21 UTCVendor advisory
  3. 2026-11-07 03:21 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  4. 2026-11-06 16:39 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  5. 2026-11-06 03:41 UTCEchelonGraph re-scored
  6. 2026-11-06 03:41 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  7. 2026-11-05 16:39 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  8. 2026-11-05 04:02 UTCEchelonGraph re-scored
  9. 2026-11-05 04:02 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  10. 2026-11-04 16:37 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  11. 2026-11-04 04:22 UTCEchelonGraph re-scored
  12. 2026-11-04 04:22 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  13. 2026-11-03 16:49 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  14. 2026-11-03 04:37 UTCEchelonGraph re-scored
  15. 2026-11-03 04:37 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  16. 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  17. 2026-11-02 04:49 UTCEchelonGraph re-scored
  18. 2026-11-02 04:49 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  19. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  20. 2026-11-01 05:09 UTCEchelonGraph re-scored
  21. 2026-11-01 05:09 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  22. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  23. 2026-10-31 05:29 UTCEchelonGraph re-scored
  24. 2026-10-31 05:29 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  25. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  26. 2026-10-30 05:50 UTCEchelonGraph re-scored
  27. 2026-10-30 05:50 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  28. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  29. 2026-10-29 06:10 UTCEchelonGraph re-scored
  30. 2026-10-29 06:10 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  31. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  32. 2026-10-28 06:31 UTCEchelonGraph re-scored
  33. 2026-10-28 06:31 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  34. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  35. 2026-10-27 06:51 UTCEchelonGraph re-scored
  36. 2026-10-27 06:51 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  37. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  38. 2026-10-26 03:51 UTCEchelonGraph re-scored
  39. 2026-10-26 03:51 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  40. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  41. 2026-10-25 13:53 UTCEchelonGraph re-scored
  42. 2026-10-25 04:12 UTCEchelonGraph re-scored
  43. 2026-10-25 04:12 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  44. 2026-10-24 16:34 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  45. 2026-10-24 04:32 UTCEchelonGraph re-scored
  46. 2026-10-24 04:32 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  47. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  48. 2026-10-23 04:52 UTCEchelonGraph re-scored
  49. 2026-10-23 04:52 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  50. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  51. 2026-10-22 05:11 UTCEchelonGraph re-scored
  52. 2026-10-22 05:11 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  53. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  54. 2026-10-21 05:31 UTCEchelonGraph re-scored
  55. 2026-10-21 05:30 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  56. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  57. 2026-10-20 05:50 UTCEchelonGraph re-scored
  58. 2026-10-20 05:49 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  59. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  60. 2026-10-19 06:08 UTCEchelonGraph re-scored
  61. 2026-10-19 06:08 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  62. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  63. 2026-10-18 06:25 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  64. 2026-10-18 03:03 UTCEchelonGraph re-scored
  65. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  66. 2026-10-17 06:43 UTCEchelonGraph re-scored
  67. 2026-10-17 06:43 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  68. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  69. 2026-10-16 07:01 UTCEchelonGraph re-scored
  70. 2026-10-16 07:01 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  71. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  72. 2026-10-15 05:48 UTCEchelonGraph re-scored
  73. 2026-10-15 05:48 UTCGHSA enrichmentGHSA-4c9g-74h5-78r7
  74. 2026-10-14 16:34 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  75. 2026-10-14 01:25 UTCEchelonGraph re-scored

Frequently asked(5)

What is CVE-2026-88920?
CVE-2026-88920 is a critical-severity vulnerability; its CVE record was published on September 30, 2026. An authentication bypass in the DOM security processor in Apache WSS4J allows unauthenticated remote attackers to forge authenticated SOAP messages via a crafted unsigned SAML sender-vouches assertion containing an attacker-controlled key. Users are recommended to upgrade to versions 4.0.2 or 3.0.6…
When was the CVE record for CVE-2026-88920 published?
The CVE record for CVE-2026-88920 was published on September 30, 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 October 2, 2026; the record at its source may have been updated since.
Is CVE-2026-88920 actively exploited?
CVE-2026-88920 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (48th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-88920?
CVE-2026-88920 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-88920?
A fix for CVE-2026-88920 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-88920 are linked in the Vendor Advisories panel on this page.

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