CVE-2026-45119

MEDIUMPre-NVD 4.64.6
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 4.6 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (6th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source

Also known asEUVD-2026-61009 (ENISA EUVD)Source: ENISA EUVD

4.6EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 4.6Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

MyBB is free and open source forum software. Prior to 1.8.40, the Admin CP UTF-8 Conversion module does not validate certain requests correctly, allowing same-site attackers to alter table encoding and deny service with a specially crafted URL. The do=all control flow in admin/modules/tools/system_health.php performs ALTER TABLE operations, column rewrite phases, and fulltext index rebuilds on GET requests for the database table named by the table parameter without request verification. The uniquely identifying implementation details include GET requests without request verification. This issue is fixed in version 1.8.40.

CVSS v3
4.6
EG Score
4.6MEDIUMmedium confidence
EG Risk
21
EG Risk 21/100

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)
Severity46% × 45%
Impact severity (EG Severity): CVSS 4.6 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.2% × 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 every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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
0.2%
EPSS %ILE
6th
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 (4.6): severity, escalated by confirmed exploitation. This CVE's 4.6 is its impact severity (EG Severity), not escalated.

EG Severity
4.6 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). 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 every mission impact level.CISA BOD 26-04: 60 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 every mission impact level.

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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)60 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 partial (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

August 18, 2026

Last Modified

September 8, 2026

Advisory Details (4)

Auto-updated Aug 18, 2026
Patch available. Sources: github, github_commit, github_release.
Web page

Version 1.8.40 - MyBB

https://mybb.com/versions/1.8.40
GitHub release Patch Available

mybb_1840

Patch available: mybb/mybb mybb_1840

https://github.com/mybb/mybb/releases/tag/mybb_1840
GitHub commit Patch Available

commit 70d445d14c83 (mybb/mybb)

Patch available: mybb/mybb mybb_1840 (contains commit 70d445d14c83)

https://github.com/mybb/mybb/commit/70d445d14c8350cc014be66f7874611abef70ab4
GitHub advisoryMentions a patch (unverified)

ACP UTF-8 Conversion CSRF · Advisory · mybb/mybb · GitHub

https://github.com/mybb/mybb/security/advisories/GHSA-p48q-4vgf-q7x8

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 28× 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 116 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 16 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  2. 2026-11-11 16:39 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  3. 2026-11-10 16:44 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  4. 2026-11-09 16:35 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  5. 2026-11-08 16:39 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  6. 2026-11-07 16:39 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  7. 2026-11-06 16:38 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  8. 2026-11-04 16:35 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  9. 2026-11-03 16:48 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  10. 2026-11-02 16:45 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  11. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  12. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  13. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  14. 2026-10-30 15:55 UTCOSV refresh
  15. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  16. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  17. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  18. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  19. 2026-10-25 14:27 UTCEchelonGraph re-scored
  20. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  21. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  22. 2026-10-22 23:38 UTCEchelonGraph re-scored
  23. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  24. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  25. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.2% · 5th percentile
Show 75 more
  1. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  2. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  3. 2026-10-18 03:38 UTCEchelonGraph re-scored
  4. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  5. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  6. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  7. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  8. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  9. 2026-10-12 16:04 UTCEchelonGraph re-scored
  10. 2026-10-11 19:46 UTCEchelonGraph re-scored
  11. 2026-10-11 17:01 UTCEchelonGraph re-scored
  12. 2026-10-11 14:26 UTCEchelonGraph re-scored
  13. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  14. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  15. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  16. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  17. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  18. 2026-10-07 11:13 UTCEchelonGraph re-scored
  19. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  20. 2026-10-06 08:23 UTCEchelonGraph re-scored
  21. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  22. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  23. 2026-10-03 17:41 UTCEchelonGraph re-scored
  24. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  25. 2026-10-02 15:38 UTCEchelonGraph re-scored
  26. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  27. 2026-10-01 12:04 UTCEchelonGraph re-scored
  28. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  29. 2026-09-30 09:49 UTCEchelonGraph re-scored
  30. 2026-09-28 09:59 UTCEchelonGraph re-scored
  31. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  32. 2026-09-27 07:57 UTCEchelonGraph re-scored
  33. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  34. 2026-09-25 12:26 UTCEchelonGraph re-scored
  35. 2026-09-24 10:23 UTCEchelonGraph re-scored
  36. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  37. 2026-09-23 08:21 UTCEchelonGraph re-scored
  38. 2026-09-22 06:18 UTCEchelonGraph re-scored
  39. 2026-09-21 03:59 UTCEchelonGraph re-scored
  40. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  41. 2026-09-20 01:56 UTCEchelonGraph re-scored
  42. 2026-09-18 23:53 UTCEchelonGraph re-scored
  43. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  44. 2026-09-16 15:09 UTCEchelonGraph re-scored
  45. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  46. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  47. 2026-09-15 11:26 UTCEchelonGraph re-scored
  48. 2026-09-14 09:18 UTCEchelonGraph re-scored
  49. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  50. 2026-09-13 07:16 UTCEchelonGraph re-scored
  51. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  52. 2026-09-12 05:13 UTCEchelonGraph re-scored
  53. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  54. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  55. 2026-09-11 03:11 UTCEchelonGraph re-scored
  56. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  57. 2026-09-10 01:07 UTCEchelonGraph re-scored
  58. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  59. 2026-09-08 21:17 UTCEchelonGraph re-scored
  60. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  61. 2026-09-07 07:05 UTCEchelonGraph re-scored
  62. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  63. 2026-09-05 02:41 UTCEchelonGraph re-scored
  64. 2026-09-02 21:57 UTCEchelonGraph re-scored
  65. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  66. 2026-09-01 17:17 UTCEchelonGraph re-scored
  67. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  68. 2026-08-31 14:57 UTCEchelonGraph re-scored
  69. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  70. 2026-08-30 12:15 UTCEchelonGraph re-scored
  71. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  72. 2026-08-29 10:12 UTCEchelonGraph re-scored
  73. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  74. 2026-08-28 08:09 UTCEchelonGraph re-scored
  75. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.1% · 2nd percentile

Frequently asked(5)

What is CVE-2026-45119?
CVE-2026-45119 is a medium-severity vulnerability; its CVE record was published on August 18, 2026. MyBB is free and open source forum software. Prior to 1.8.40, the Admin CP UTF-8 Conversion module does not validate certain requests correctly, allowing same-site attackers to alter table encoding and deny service with a specially crafted URL. The do=all control flow in…
When was the CVE record for CVE-2026-45119 published?
The CVE record for CVE-2026-45119 was published on August 18, 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 September 8, 2026; the record at its source may have been updated since.
Is CVE-2026-45119 actively exploited?
CVE-2026-45119 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (6th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-45119?
CVE-2026-45119 has a CVSS base score of 4.6 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-45119?
A fix for CVE-2026-45119 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

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