CVE-2026-86112

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreHIGH confidence

Score 5.4 from GitHub Security Advisory published 2026-09-05. a secondary CVSS source baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: None knownExposed: 0

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

BookWyrm through 0.9.1 fails to validate user visibility permissions in the Favorite and Unfavorite views, allowing authenticated attackers to favorite or unfavorite followers-only and direct statuses they cannot access. Attackers can POST to the favorite endpoint with a status ID to create unauthorized interactions, trigger ActivityPub broadcasts, and enumerate private status IDs through response differentiation.

CVSS v3
5.4
EG Score
5.4(high)
EG Risk
24(Track)
EG Risk 24/100SSVC: 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
Severity54% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
8%
KEV
Not listed

Published

September 5, 2026

Last Modified

September 10, 2026

Advisory Details (4)

Auto-updated Sep 5, 2026
No patch confirmed yet.
generic

BookWyrm through 0.9.1 Missing Authorization on the Favorite and Unfavorite Endpoints | Advisories | VulnCheck

https://www.vulncheck.com/advisories/bookwyrm-through-0.9.1-missing-authorization-on-the-favorite-and-unfavorite-endpoints
generic

oss/bookwyrm.md at main · geo-chen/oss · GitHub

https://github.com/geo-chen/oss/blob/main/bookwyrm.md#finding-2-authenticated-idor-in-favoriteunfavorite-allows-interaction-with-private-statuses
generic

bookwyrm/bookwyrm/views/interaction.py at v0.9.1 · bookwyrm-social/bookwyrm · GitHub

https://github.com/bookwyrm-social/bookwyrm/blob/v0.9.1/bookwyrm/views/interaction.py
generic

GitHub - bookwyrm-social/bookwyrm: Social reading and reviewing, decentralized with ActivityPub · GitHub

https://github.com/bookwyrm-social/bookwyrm

Vendor Advisories for CVE-2026-86112(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 20× in last 7d / 45× 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. 2026-09-21 00:51 UTCEG score recompute
  2. 2026-09-21 00:51 UTCGHSA enrichment
  3. 2026-09-20 20:16 UTCEPSS rescore
  4. 2026-09-20 00:03 UTCEG score recompute
  5. 2026-09-20 00:03 UTCGHSA enrichment
  6. 2026-09-18 23:15 UTCEG score recompute
  7. 2026-09-18 23:15 UTCGHSA enrichment
  8. 2026-09-18 19:28 UTCEPSS rescore
  9. 2026-09-17 22:28 UTCEG score recompute
  10. 2026-09-17 22:28 UTCGHSA enrichment
  11. 2026-09-17 19:32 UTCEPSS rescore
  12. 2026-09-16 21:41 UTCEG score recompute
  13. 2026-09-16 21:41 UTCGHSA enrichment
  14. 2026-09-16 14:09 UTCEPSS rescore
  15. 2026-09-16 05:15 UTCEPSS rescore
  16. 2026-09-15 20:52 UTCEG score recompute
  17. 2026-09-15 20:52 UTCGHSA enrichment
  18. 2026-09-15 03:12 UTCEPSS rescore
  19. 2026-09-15 03:12 UTCEPSS rescore
  20. 2026-09-14 19:48 UTCGHSA enrichment
  21. 2026-09-13 19:01 UTCEG score recompute
  22. 2026-09-13 19:01 UTCGHSA enrichment
  23. 2026-09-12 18:13 UTCEG score recompute
  24. 2026-09-12 18:13 UTCGHSA enrichment
  25. 2026-09-11 17:25 UTCEG score recompute
Show 20 more
  1. 2026-09-11 17:25 UTCGHSA enrichment
  2. 2026-09-11 14:53 UTCEPSS rescore
  3. 2026-09-11 14:53 UTCEPSS rescore
  4. 2026-09-10 16:25 UTCEG score recompute
  5. 2026-09-10 16:25 UTCGHSA enrichment
  6. 2026-09-10 15:27 UTCEG score recompute
  7. 2026-09-10 15:27 UTCGHSA enrichment
  8. 2026-09-09 23:20 UTCEG score recompute
  9. 2026-09-09 23:20 UTCGHSA enrichment
  10. 2026-09-08 22:01 UTCEPSS rescore
  11. 2026-09-08 20:14 UTCGHSA enrichment
  12. 2026-09-08 12:47 UTCEG score recompute
  13. 2026-09-08 12:47 UTCGHSA enrichment
  14. 2026-09-07 11:57 UTCEG score recompute
  15. 2026-09-07 11:56 UTCGHSA enrichment
  16. 2026-09-06 13:48 UTCEPSS rescore
  17. 2026-09-06 11:05 UTCEG score recompute
  18. 2026-09-06 11:05 UTCGHSA enrichment
  19. 2026-09-05 10:17 UTCEG score recompute
  20. 2026-09-05 10:13 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-86112?
CVE-2026-86112 is a medium vulnerability published on September 5, 2026. BookWyrm through 0.9.1 fails to validate user visibility permissions in the Favorite and Unfavorite views, allowing authenticated attackers to favorite or unfavorite followers-only and direct statuses they cannot access. Attackers can POST to the favorite endpoint with a status ID to create…
When was CVE-2026-86112 disclosed?
CVE-2026-86112 was first published in the National Vulnerability Database on September 5, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86112 actively exploited?
CVE-2026-86112 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 92.5% of all scored CVEs.
What is the CVSS score of CVE-2026-86112?
CVE-2026-86112 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-86112?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86112, 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

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