CVE-2026-86178

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreHIGH confidence

Score 5.4 from GitHub Security Advisory published 2026-09-05. the CNA's CVSS baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
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.

Pixelfed through 0.12.9 fails to validate follower status in StoryComposeController react and comment endpoints, allowing authenticated users to access follower-only stories. Attackers can enumerate sequential story IDs and submit reactions or comments to retrieve story media URLs and author information without following the account.

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
22%
KEV
Not listed

Published

September 5, 2026

Last Modified

September 24, 2026

Advisory Details (6)

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

Pixelfed through 0.12.9 Unauthorized Story Access via API | Advisories | VulnCheck

https://www.vulncheck.com/advisories/pixelfed-through-0.12.9-unauthorized-story-access-via-api
generic

pixelfed/routes/web-api.php at v0.12.9 · pixelfed/pixelfed · GitHub

https://github.com/pixelfed/pixelfed/blob/v0.12.9/routes/web-api.php#L154-L155
generic

pixelfed/app/Http/Controllers/StoryComposeController.php at v0.12.9 · pixelfed/pixelfed · GitHub

https://github.com/pixelfed/pixelfed/blob/v0.12.9/app/Http/Controllers/StoryComposeController.php#L566-L580
generic

pixelfed/app/Http/Controllers/StoryComposeController.php at v0.12.9 · pixelfed/pixelfed · GitHub

https://github.com/pixelfed/pixelfed/blob/v0.12.9/app/Http/Controllers/StoryComposeController.php#L487-L501
generic

GitHub - pixelfed/pixelfed: Photo Sharing. For Everyone. · GitHub

https://github.com/pixelfed/pixelfed
generic

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

https://github.com/geo-chen/oss/blob/main/Pixelfed.md

Vendor Advisories for CVE-2026-86178(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 16× in last 7d / 56× 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. 2026-09-24 14:55 UTCEG score recompute
  2. 2026-09-24 14:55 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-23 17:23 UTCGHSA enrichment
  5. 2026-09-22 19:19 UTCEG score recompute
  6. 2026-09-22 19:19 UTCGHSA enrichment
  7. 2026-09-22 16:01 UTCEPSS rescore
  8. 2026-09-21 21:09 UTCEPSS rescore
  9. 2026-09-21 17:37 UTCEG score recompute
  10. 2026-09-21 17:37 UTCGHSA enrichment
  11. 2026-09-20 20:16 UTCEPSS rescore
  12. 2026-09-20 15:52 UTCEG score recompute
  13. 2026-09-20 15:52 UTCGHSA enrichment
  14. 2026-09-19 14:12 UTCEG score recompute
  15. 2026-09-19 14:12 UTCGHSA enrichment
  16. 2026-09-18 19:28 UTCEPSS rescore
  17. 2026-09-18 12:32 UTCEG score recompute
  18. 2026-09-18 12:32 UTCGHSA enrichment
  19. 2026-09-17 19:32 UTCEPSS rescore
  20. 2026-09-17 10:53 UTCEG score recompute
  21. 2026-09-17 10:53 UTCGHSA enrichment
  22. 2026-09-16 14:09 UTCEPSS rescore
  23. 2026-09-16 09:14 UTCEG score recompute
  24. 2026-09-16 09:14 UTCGHSA enrichment
  25. 2026-09-16 05:15 UTCEPSS rescore
Show 31 more
  1. 2026-09-15 07:35 UTCEG score recompute
  2. 2026-09-15 07:35 UTCGHSA enrichment
  3. 2026-09-15 03:12 UTCEPSS rescore
  4. 2026-09-15 03:12 UTCEPSS rescore
  5. 2026-09-14 05:56 UTCEG score recompute
  6. 2026-09-14 05:56 UTCGHSA enrichment
  7. 2026-09-13 04:18 UTCEG score recompute
  8. 2026-09-13 04:18 UTCGHSA enrichment
  9. 2026-09-12 02:39 UTCEG score recompute
  10. 2026-09-12 02:39 UTCGHSA enrichment
  11. 2026-09-11 14:53 UTCEPSS rescore
  12. 2026-09-11 14:53 UTCEPSS rescore
  13. 2026-09-11 00:59 UTCEG score recompute
  14. 2026-09-11 00:59 UTCGHSA enrichment
  15. 2026-09-09 23:20 UTCEG score recompute
  16. 2026-09-09 23:20 UTCGHSA enrichment
  17. 2026-09-08 22:01 UTCEPSS rescore
  18. 2026-09-08 19:55 UTCEG score recompute
  19. 2026-09-08 19:55 UTCGHSA enrichment
  20. 2026-09-08 18:15 UTCEG score recompute
  21. 2026-09-08 18:15 UTCGHSA enrichment
  22. 2026-09-08 16:26 UTCEG score recompute
  23. 2026-09-08 16:25 UTCGHSA enrichment
  24. 2026-09-07 14:43 UTCEG score recompute
  25. 2026-09-07 14:43 UTCGHSA enrichment
  26. 2026-09-06 13:48 UTCEPSS rescore
  27. 2026-09-06 13:00 UTCEG score recompute
  28. 2026-09-06 13:00 UTCGHSA enrichment
  29. 2026-09-05 11:22 UTCEG score recompute
  30. 2026-09-05 11:03 UTCEG score recompute
  31. 2026-09-05 11:02 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-86178?
CVE-2026-86178 is a medium vulnerability published on September 5, 2026. Pixelfed through 0.12.9 fails to validate follower status in StoryComposeController react and comment endpoints, allowing authenticated users to access follower-only stories. Attackers can enumerate sequential story IDs and submit reactions or comments to retrieve story media URLs and author…
When was CVE-2026-86178 disclosed?
CVE-2026-86178 was first published in the National Vulnerability Database on September 5, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86178 actively exploited?
CVE-2026-86178 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 77.7% of all scored CVEs.
What is the CVSS score of CVE-2026-86178?
CVE-2026-86178 has a CVSS v4.0 base score of 5.4 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-86178?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86178, 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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