CVE-2026-77929

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-18. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: None knownExposed: 0

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

ClipBucket v5 before 5.5.3-#182 contains a file upload vulnerability that allows authenticated users to achieve remote code execution by uploading a PHP file with valid image magic bytes through the photo upload endpoint. The FileUpload::manageFile() function in fileupload.class.php fails to update the file extension after MIME validation, allowing an attacker-controlled .php extension to persist on disk and execute as PHP via PHP-FPM when the uploaded file is retrieved.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

September 18, 2026

Last Modified

September 18, 2026

Advisory Details (3)

Auto-updated Sep 18, 2026
Patch available. Sources: github_release, github_commit.
generic

ClipBucket < 5.5.3-#182 Remote Code Execution via Photo Upload Endpoint | Advisories | VulnCheck

https://www.vulncheck.com/advisories/clipbucket-remote-code-execution-via-photo-upload-endpoint
github_commit Patch Available

commit 61cce55ab26e (MacWarrior/clipbucket-v5)

Patch available: MacWarrior/clipbucket-v5 5.5.3-#182 (contains commit 61cce55ab26e)

https://github.com/MacWarrior/clipbucket-v5/commit/61cce55ab26ef88fb782dfde47b44c17c56978cd
github_release Patch Available

5.5.3 - #182

Patch available: MacWarrior/clipbucket-v5 5.5.3-#182

https://github.com/MacWarrior/clipbucket-v5/releases/tag/5.5.3-%23182

Vendor Advisories for CVE-2026-77929(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 / 16× 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 13:24 UTCGHSA enrichment
  2. 2026-09-21 01:55 UTCEG score recompute
  3. 2026-09-21 01:55 UTCGHSA enrichment
  4. 2026-09-20 20:16 UTCEPSS rescore
  5. 2026-09-20 14:26 UTCGHSA enrichment
  6. 2026-09-20 02:56 UTCEG score recompute
  7. 2026-09-20 02:56 UTCGHSA enrichment
  8. 2026-09-19 15:27 UTCGHSA enrichment
  9. 2026-09-19 03:56 UTCGHSA enrichment
  10. 2026-09-18 16:27 UTCEG score recompute
  11. 2026-09-18 16:27 UTCGHSA enrichment
  12. 2026-09-18 15:39 UTCEG score recompute
  13. 2026-09-18 15:38 UTCGHSA enrichment
  14. 2026-09-18 15:24 UTCEG score recompute
  15. 2026-09-18 14:34 UTCEG score recompute
  16. 2026-09-18 14:34 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-77929?
CVE-2026-77929 is a high vulnerability published on September 18, 2026. ClipBucket v5 before 5.5.3-#182 contains a file upload vulnerability that allows authenticated users to achieve remote code execution by uploading a PHP file with valid image magic bytes through the photo upload endpoint. The FileUpload::manageFile() function in fileupload.class.php fails to update…
When was CVE-2026-77929 disclosed?
CVE-2026-77929 was first published in the National Vulnerability Database on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77929 actively exploited?
CVE-2026-77929 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 57.5% of all scored CVEs.
What is the CVSS score of CVE-2026-77929?
CVE-2026-77929 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-77929?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77929, 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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