CVE-2026-88421

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-25. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.5Exploit: Elevated riskExposed services: Not assessed

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

Incorrect access control in the BlogPage.get_entries() component of APSL puput v1.2.1 through v2.2.0 allows unauthenticated attackers to view restricted blog entries via the blog index, the tag, category, author and date archives, the sidebar widgets, or the RSS feed.

CVSS v3
7.5
EG Score
7.5HIGHhigh confidence
EG Risk
65
EG Risk 65/100CISA SSVC

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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.3%
EPSS %ILE
20th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 25, 2026

Last Modified

September 30, 2026

Advisory Details (1)

Auto-updated Sep 25, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

CVE-2026-88421: Restricted Puput entries disclosed to unauthenticated users · GitHub

https://gist.github.com/itsmohitnarayan/736225bd6cd79031a5dfbf56acdb14ae

Vendor Advisories for CVE-2026-88421(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 24× in last 7d / 41× 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. 2026-10-04 10:37 UTCGHSA enrichment
  2. 2026-10-03 23:29 UTCEG score recompute
  3. 2026-10-03 23:29 UTCGHSA enrichment
  4. 2026-10-03 12:23 UTCGHSA enrichment
  5. 2026-10-03 01:19 UTCEG score recompute
  6. 2026-10-03 01:19 UTCGHSA enrichment
  7. 2026-10-02 14:12 UTCGHSA enrichment
  8. 2026-10-02 03:07 UTCEG score recompute
  9. 2026-10-02 03:07 UTCGHSA enrichment
  10. 2026-10-01 19:51 UTCEPSS rescore
  11. 2026-10-01 15:57 UTCGHSA enrichment
  12. 2026-10-01 04:54 UTCGHSA enrichment
  13. 2026-09-30 17:48 UTCEG score recompute
  14. 2026-09-30 17:48 UTCGHSA enrichment
  15. 2026-09-30 15:04 UTCEPSS rescore
  16. 2026-09-30 10:57 UTCGHSA enrichment
  17. 2026-09-29 23:52 UTCEG score recompute
  18. 2026-09-29 23:52 UTCGHSA enrichment
  19. 2026-09-29 10:25 UTCGHSA enrichment
  20. 2026-09-28 23:17 UTCEG score recompute
  21. 2026-09-28 23:17 UTCGHSA enrichment
  22. 2026-09-28 13:52 UTCEPSS rescore
  23. 2026-09-28 12:11 UTCGHSA enrichment
  24. 2026-09-28 01:08 UTCGHSA enrichment
  25. 2026-09-27 14:04 UTCEG score recompute
Show 16 more
  1. 2026-09-27 14:04 UTCGHSA enrichment
  2. 2026-09-27 13:48 UTCEPSS rescore
  3. 2026-09-27 03:01 UTCEG score recompute
  4. 2026-09-27 03:01 UTCGHSA enrichment
  5. 2026-09-26 15:59 UTCEPSS rescore
  6. 2026-09-26 15:56 UTCGHSA enrichment
  7. 2026-09-26 04:47 UTCEG score recompute
  8. 2026-09-26 04:47 UTCGHSA enrichment
  9. 2026-09-25 17:44 UTCEG score recompute
  10. 2026-09-25 17:44 UTCGHSA enrichment
  11. 2026-09-25 16:50 UTCEG score recompute▲ 7.50
  12. 2026-09-25 16:49 UTCGHSA enrichment
  13. 2026-09-25 16:49 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  14. 2026-09-25 13:18 UTCNVD update
  15. 2026-09-25 13:04 UTCEG score recompute
  16. 2026-09-25 13:04 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-88421?
CVE-2026-88421 is a high vulnerability published on September 25, 2026. Incorrect access control in the BlogPage.get_entries() component of APSL puput v1.2.1 through v2.2.0 allows unauthenticated attackers to view restricted blog entries via the blog index, the tag, category, author and date archives, the sidebar widgets, or the RSS feed.
When was CVE-2026-88421 disclosed?
CVE-2026-88421 was first published on September 25, 2026, with the most recent update on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-88421 actively exploited?
CVE-2026-88421 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (20th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-88421?
CVE-2026-88421 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-88421?
No fix for CVE-2026-88421 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-88421 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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