CVE-2026-45677

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 64% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
8.7
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.7Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Rocket.Chat is an open-source, secure, fully customizable communications platform. Prior to 8.5.0, 8.4.1, 8.3.3, 8.2.3, 8.1.4, 8.0.5, 7.13.7, and 7.10.11, Rocket.Chat's SAML integration does not verify the signature on inbound LogoutRequest messages. An unauthenticated remote attacker who knows a target user's SAML NameID - which major identity providers (Okta, Google Workspace, Microsoft Entra ID, JumpCloud) expose as the user's email address - can craft a valid-looking unsigned LogoutRequest and submit it to the SP logout endpoint. The server processes it as legitimate, immediately destroying the victim's session. Because the attack requires no authentication and no interaction from the victim, it can be repeated in a loop against individual users or scripted across many accounts, effectively rendering the Rocket.Chat instance unusable for SAML-authenticated users. This vulnerability is fixed in 8.5.0, 8.4.1, 8.3.3, 8.2.3, 8.1.4, 8.0.5, 7.13.7, and 7.10.11.

CVSS v3
8.7
EG Score
8.7(medium)
EPSS
36.4%
KEV
Not listed

Published

June 24, 2026

Last Modified

June 25, 2026

Advisory Details (1)

Auto-updated Jun 24, 2026
Patch available. Sources: github.
github Patch Available

Lack of SAML Signature Check During Logout Could Lead To DoS · Advisory · RocketChat/Rocket.Chat · GitHub

https://github.com/RocketChat/Rocket.Chat/security/advisories/GHSA-pw6f-q8ww-vqfq

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 21× in last 7d / 66× 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. 2026-07-15 18:10 UTCEG score recompute
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 06:18 UTCEG score recompute
  4. 2026-07-15 02:00 UTCEPSS rescore
  5. 2026-07-14 18:24 UTCEG score recompute
  6. 2026-07-14 06:32 UTCEG score recompute
  7. 2026-07-13 22:30 UTCEPSS rescore
  8. 2026-07-13 18:35 UTCEG score recompute
  9. 2026-07-13 06:44 UTCEG score recompute
  10. 2026-07-13 06:13 UTCEPSS rescore
  11. 2026-07-12 18:51 UTCEG score recompute
  12. 2026-07-12 06:59 UTCEG score recompute
  13. 2026-07-12 05:46 UTCEPSS rescore
  14. 2026-07-11 19:07 UTCEG score recompute
  15. 2026-07-11 08:27 UTCEPSS rescore
  16. 2026-07-11 07:15 UTCEG score recompute
  17. 2026-07-10 19:23 UTCEG score recompute
  18. 2026-07-10 07:32 UTCEG score recompute
  19. 2026-07-09 19:39 UTCEG score recompute
  20. 2026-07-09 19:10 UTCEPSS rescore
  21. 2026-07-09 07:48 UTCEG score recompute
  22. 2026-07-08 19:56 UTCEG score recompute
  23. 2026-07-08 15:16 UTCEPSS rescore
  24. 2026-07-08 08:04 UTCEG score recompute
  25. 2026-07-07 20:11 UTCEG score recompute
Show 41 more
  1. 2026-07-07 13:46 UTCEPSS rescore
  2. 2026-07-07 08:19 UTCEG score recompute
  3. 2026-07-06 20:27 UTCEG score recompute
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 08:25 UTCEG score recompute
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-05 20:32 UTCEG score recompute
  8. 2026-07-05 08:40 UTCEG score recompute
  9. 2026-07-05 02:30 UTCEPSS rescore
  10. 2026-07-04 20:48 UTCEG score recompute
  11. 2026-07-04 08:57 UTCEG score recompute
  12. 2026-07-04 06:31 UTCEPSS rescore
  13. 2026-07-03 21:04 UTCEG score recompute
  14. 2026-07-03 09:12 UTCEG score recompute
  15. 2026-07-02 21:20 UTCEG score recompute
  16. 2026-07-02 09:29 UTCEG score recompute
  17. 2026-07-01 21:37 UTCEG score recompute
  18. 2026-07-01 15:07 UTCEPSS rescore
  19. 2026-07-01 09:45 UTCEG score recompute
  20. 2026-06-30 23:22 UTCEPSS rescore
  21. 2026-06-30 21:51 UTCEG score recompute
  22. 2026-06-30 09:59 UTCEG score recompute
  23. 2026-06-29 22:06 UTCEG score recompute
  24. 2026-06-29 14:06 UTCEPSS rescore
  25. 2026-06-29 14:06 UTCEPSS rescore
  26. 2026-06-29 10:13 UTCEG score recompute
  27. 2026-06-28 22:20 UTCEG score recompute
  28. 2026-06-28 14:07 UTCEPSS rescore
  29. 2026-06-28 10:29 UTCEG score recompute
  30. 2026-06-28 04:56 UTCEPSS rescore
  31. 2026-06-28 04:56 UTCEPSS rescore
  32. 2026-06-27 22:37 UTCEG score recompute
  33. 2026-06-27 10:45 UTCEG score recompute
  34. 2026-06-27 03:08 UTCEPSS rescore
  35. 2026-06-26 22:52 UTCEG score recompute
  36. 2026-06-26 11:00 UTCEG score recompute
  37. 2026-06-25 21:48 UTCEG score recompute
  38. 2026-06-25 13:49 UTCEPSS rescore
  39. 2026-06-25 09:56 UTCEG score recompute
  40. 2026-06-24 22:03 UTCEG score recompute
  41. 2026-06-24 22:03 UTCNVD updatefirst tracked

Frequently asked(5)

What is CVE-2026-45677?
CVE-2026-45677 is a high vulnerability published on June 24, 2026. Rocket.Chat is an open-source, secure, fully customizable communications platform. Prior to 8.5.0, 8.4.1, 8.3.3, 8.2.3, 8.1.4, 8.0.5, 7.13.7, and 7.10.11, Rocket.Chat's SAML integration does not verify the signature on inbound LogoutRequest messages. An unauthenticated remote attacker who knows a…
When was CVE-2026-45677 disclosed?
CVE-2026-45677 was first published in the National Vulnerability Database on June 24, 2026, with the most recent update on June 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45677 actively exploited?
CVE-2026-45677 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 36.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45677?
CVE-2026-45677 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-45677?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45677, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-45677

Explore →

Is Your Infrastructure Affected by CVE-2026-45677?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs