CVE-2026-82271

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-28. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: Elevated riskExposed: 0

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

R2R through 3.6.5 fails to properly validate user ownership in conversation update and message handlers, allowing authenticated users to modify other users' conversations. Attackers can supply arbitrary conversation identifiers to rename conversations and append messages to other users' conversation histories, corrupting state and injecting malicious content.

CVSS v3
6.5
EG Score
6.5(high)
EG Risk
45(Track*)
EG Risk 45/100SSVC: Track*

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
Severity65% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
13%
KEV
Not listed

Published

August 28, 2026

Last Modified

August 31, 2026

Advisory Details (4)

Auto-updated Aug 28, 2026
No patch confirmed yet.
generic

R2R Missing Ownership Check Allows Modifying Other Users' Conversations | Advisories | VulnCheck

https://www.vulncheck.com/advisories/r2r-missing-ownership-check-allows-modifying-other-users-conversations
generic

R2R/py/core/main/api/v3/conversations_router.py at 9c5a94d151f90876bd7eb860f300a8fd662dc481 · SciPhi-AI/R2R · GitHub

https://github.com/SciPhi-AI/R2R/blob/9c5a94d151f90876bd7eb860f300a8fd662dc481/py/core/main/api/v3/conversations_router.py
generic

GitHub - SciPhi-AI/R2R: SoTA production-ready AI retrieval system. Agentic Retrieval-Augmented Generation (RAG) with a RESTful API. · GitHub

https://github.com/SciPhi-AI/R2R
generic

[Security] Cross-user conversation IDOR · Issue #2292 · SciPhi-AI/R2R · GitHub

https://github.com/SciPhi-AI/R2R/issues/2292

Vendor Advisories for CVE-2026-82271(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 18× in last 7d / 67× 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. 2026-09-20 20:16 UTCEPSS rescore
  2. 2026-09-20 18:08 UTCGHSA enrichment
  3. 2026-09-19 18:58 UTCEG score recompute
  4. 2026-09-19 18:58 UTCGHSA enrichment
  5. 2026-09-18 19:55 UTCEG score recompute
  6. 2026-09-18 19:55 UTCGHSA enrichment
  7. 2026-09-18 19:28 UTCEPSS rescore
  8. 2026-09-17 20:51 UTCEG score recompute
  9. 2026-09-17 20:51 UTCGHSA enrichment
  10. 2026-09-16 18:58 UTCEG score recompute
  11. 2026-09-16 18:58 UTCGHSA enrichment
  12. 2026-09-16 14:08 UTCEPSS rescore
  13. 2026-09-16 05:15 UTCEPSS rescore
  14. 2026-09-15 18:28 UTCEG score recompute
  15. 2026-09-15 18:28 UTCGHSA enrichment
  16. 2026-09-15 03:12 UTCEPSS rescore
  17. 2026-09-15 03:12 UTCEPSS rescore
  18. 2026-09-14 19:07 UTCGHSA enrichment
  19. 2026-09-13 20:04 UTCEG score recompute
  20. 2026-09-13 20:04 UTCGHSA enrichment
  21. 2026-09-12 21:01 UTCEG score recompute
  22. 2026-09-12 21:01 UTCGHSA enrichment
  23. 2026-09-11 21:58 UTCEG score recompute
  24. 2026-09-11 21:58 UTCGHSA enrichment
  25. 2026-09-11 14:53 UTCEPSS rescore
Show 42 more
  1. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-10 22:55 UTCEG score recompute
  3. 2026-09-10 22:55 UTCGHSA enrichment
  4. 2026-09-09 23:52 UTCGHSA enrichment
  5. 2026-09-09 00:28 UTCEG score recompute
  6. 2026-09-09 00:28 UTCGHSA enrichment
  7. 2026-09-08 22:01 UTCEPSS rescore
  8. 2026-09-07 15:52 UTCGHSA enrichment
  9. 2026-09-06 16:49 UTCEG score recompute
  10. 2026-09-06 16:49 UTCGHSA enrichment
  11. 2026-09-06 13:48 UTCEPSS rescore
  12. 2026-09-05 17:46 UTCEG score recompute
  13. 2026-09-05 17:46 UTCGHSA enrichment
  14. 2026-09-05 15:31 UTCEPSS rescore
  15. 2026-09-04 18:44 UTCEG score recompute
  16. 2026-09-04 18:44 UTCGHSA enrichment
  17. 2026-09-04 05:07 UTCEPSS rescore
  18. 2026-09-03 19:30 UTCGHSA enrichment
  19. 2026-09-02 20:24 UTCEG score recompute
  20. 2026-09-02 20:24 UTCGHSA enrichment
  21. 2026-09-02 14:12 UTCEPSS rescore
  22. 2026-09-01 19:37 UTCEG score recompute
  23. 2026-09-01 19:37 UTCGHSA enrichment
  24. 2026-09-01 13:54 UTCEPSS rescore
  25. 2026-09-01 04:40 UTCEPSS rescore
  26. 2026-09-01 04:40 UTCEPSS rescore
  27. 2026-08-31 20:23 UTCEG score recompute
  28. 2026-08-31 20:23 UTCGHSA enrichment
  29. 2026-08-31 19:32 UTCEG score recompute
  30. 2026-08-31 19:31 UTCGHSA enrichment
  31. 2026-08-31 17:35 UTCEG score recompute
  32. 2026-08-31 17:34 UTCGHSA enrichment
  33. 2026-08-30 19:18 UTCEPSS rescore
  34. 2026-08-30 19:17 UTCEPSS rescore
  35. 2026-08-30 18:32 UTCEG score recompute
  36. 2026-08-30 18:32 UTCGHSA enrichment
  37. 2026-08-30 01:22 UTCEPSS rescore
  38. 2026-08-29 19:29 UTCEG score recompute
  39. 2026-08-29 19:29 UTCGHSA enrichment
  40. 2026-08-28 20:26 UTCEG score recompute
  41. 2026-08-28 19:40 UTCEG score recompute
  42. 2026-08-28 19:36 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-82271?
CVE-2026-82271 is a medium vulnerability published on August 28, 2026. R2R through 3.6.5 fails to properly validate user ownership in conversation update and message handlers, allowing authenticated users to modify other users' conversations. Attackers can supply arbitrary conversation identifiers to rename conversations and append messages to other users'…
When was CVE-2026-82271 disclosed?
CVE-2026-82271 was first published in the National Vulnerability Database on August 28, 2026, with the most recent update on August 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-82271 actively exploited?
CVE-2026-82271 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 87.1% of all scored CVEs.
What is the CVSS score of CVE-2026-82271?
CVE-2026-82271 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-82271?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82271, 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-2026-82271

Explore →

Is Your Infrastructure Affected by CVE-2026-82271?

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

Start Free Scan →Browse All CVEs