CVE-2026-82377

CRITICALPre-NVD 9.99.9—
EchelonGraph scoreHIGH confidence

Score 9.9 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-28. A secondary CVSS source baseline 9.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.9EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 9.9Exploit: None knownExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

Missing Authorization in Apache Roller 6.1.5 allows an authenticated user to read, modify, or delete weblog content belonging to other weblogs through the legacy XML-RPC Blogger and MetaWeblog APIs, because the handlers authenticate the caller but do not verify the caller's permission on the weblog or entry actually affected. Only installations that enable the non-default global XML-RPC setting are affected; the per-weblog API flag defaults to enabled for UI-created weblogs. Users are recommended to upgrade to Apache Roller 6.1.6 or later, which applies an explicit per-method permission check, or to keep the XML-RPC feature disabled.

CVSS v3
9.9
EG Score
9.9CRITICALhigh confidence
EG Risk
45
EG Risk 45/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity99% × 45%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release.
EPSS PROB
0.5%
EPSS %ILE
43rd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 28, 2026

Last Modified

September 29, 2026

Advisory Details (3)

Auto-updated Sep 29, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
generic

oss-security - CVE-2026-82377: Apache Roller: Missing weblog authorization in XML-RPC Blogger/MetaWeblog handlers

http://www.openwall.com/lists/oss-security/2026/09/25/10
generic

Pony Mail

https://lists.apache.org/thread/phxx56n0w6jjqzto2my3ot8hto0qjvn8
github_pr

Check weblog permission in XML-RPC Blogger/MetaWeblog handlers

Fix merged in apache/roller PR #164 on 2026-09-05 — awaiting tagged release

https://github.com/apache/roller/pull/164

Vendor Advisories for CVE-2026-82377(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 60× in last 7d / 60× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-04 12:31 UTCGHSA enrichment
  2. 2026-10-04 08:48 UTCGHSA enrichment
  3. 2026-10-04 05:04 UTCGHSA enrichment
  4. 2026-10-04 01:21 UTCGHSA enrichment
  5. 2026-10-03 21:38 UTCGHSA enrichment
  6. 2026-10-03 17:55 UTCEG score recompute
  7. 2026-10-03 17:54 UTCGHSA enrichment
  8. 2026-10-03 14:26 UTCEPSS rescore
  9. 2026-10-03 14:10 UTCGHSA enrichment
  10. 2026-10-03 10:27 UTCGHSA enrichment
  11. 2026-10-03 06:44 UTCGHSA enrichment
  12. 2026-10-03 03:00 UTCGHSA enrichment
  13. 2026-10-02 23:17 UTCGHSA enrichment
  14. 2026-10-02 19:29 UTCEG score recompute
  15. 2026-10-02 19:29 UTCGHSA enrichment
  16. 2026-10-02 17:57 UTCEPSS rescore
  17. 2026-10-02 15:45 UTCGHSA enrichment
  18. 2026-10-02 12:02 UTCGHSA enrichment
  19. 2026-10-02 08:14 UTCGHSA enrichment
  20. 2026-10-02 04:30 UTCGHSA enrichment
  21. 2026-10-02 00:43 UTCGHSA enrichment
  22. 2026-10-01 20:55 UTCEG score recompute
  23. 2026-10-01 20:55 UTCGHSA enrichment
  24. 2026-10-01 19:50 UTCEPSS rescore
  25. 2026-10-01 17:08 UTCGHSA enrichment
Show 35 more
  1. 2026-10-01 13:25 UTCGHSA enrichment
  2. 2026-10-01 09:41 UTCGHSA enrichment
  3. 2026-10-01 05:58 UTCGHSA enrichment
  4. 2026-10-01 02:15 UTCGHSA enrichment
  5. 2026-09-30 22:32 UTCGHSA enrichment
  6. 2026-09-30 18:47 UTCEG score recompute
  7. 2026-09-30 18:47 UTCGHSA enrichment
  8. 2026-09-30 15:04 UTCEPSS rescore
  9. 2026-09-30 14:42 UTCGHSA enrichment
  10. 2026-09-30 10:59 UTCGHSA enrichment
  11. 2026-09-30 07:13 UTCGHSA enrichment
  12. 2026-09-30 03:29 UTCGHSA enrichment
  13. 2026-09-29 23:46 UTCGHSA enrichment
  14. 2026-09-29 16:43 UTCGHSA enrichment
  15. 2026-09-29 15:48 UTCEG score recompute
  16. 2026-09-29 15:48 UTCGHSA enrichment
  17. 2026-09-29 12:02 UTCGHSA enrichment
  18. 2026-09-29 08:15 UTCGHSA enrichment
  19. 2026-09-29 04:31 UTCEG score recompute
  20. 2026-09-29 04:31 UTCGHSA enrichment
  21. 2026-09-29 04:00 UTCEG score recompute
  22. 2026-09-29 04:00 UTCGHSA enrichment
  23. 2026-09-29 01:40 UTCGHSA enrichment
  24. 2026-09-28 21:57 UTCEG score recompute
  25. 2026-09-28 21:57 UTCGHSA enrichment
  26. 2026-09-28 18:13 UTCGHSA enrichment
  27. 2026-09-28 14:30 UTCEG score recompute
  28. 2026-09-28 14:30 UTCGHSA enrichment
  29. 2026-09-28 13:52 UTCEPSS rescore
  30. 2026-09-28 13:15 UTCGHSA enrichment
  31. 2026-09-28 09:32 UTCEG score recompute
  32. 2026-09-28 09:32 UTCGHSA enrichment
  33. 2026-09-28 08:29 UTCEG score recompute
  34. 2026-09-28 07:47 UTCEG score recompute
  35. 2026-09-28 07:47 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-82377?
CVE-2026-82377 is a critical vulnerability published on September 28, 2026. Missing Authorization in Apache Roller 6.1.5 allows an authenticated user to read, modify, or delete weblog content belonging to other weblogs through the legacy XML-RPC Blogger and MetaWeblog APIs, because the handlers authenticate the caller but do not verify the caller's permission on the weblog…
When was CVE-2026-82377 disclosed?
CVE-2026-82377 was first published on September 28, 2026, with the most recent update on September 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-82377 actively exploited?
CVE-2026-82377 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (43rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-82377?
CVE-2026-82377 has a CVSS base score of 9.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-82377?
An upstream fix for CVE-2026-82377 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-82377 are linked in the Vendor Advisories panel on this page.

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