CVE-2026-88420

MEDIUMPre-NVD 5.46.1▲
EchelonGraph scoreHIGH confidence

Score 6.1 from GitHub Security Advisory published 2026-09-25. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.4; sources differ by 0.7.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this weekElevated
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.4Exploit: Elevated riskExposed services: Not assessed

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

A reflected cross-site scripting (XSS) vulnerability in the EntryAbstract.save() component of APSL puput v1.2.1 through v2.2.0 allows authenticated attackers with Wagtail Editor privileges to execute arbitrary code in the context of the victim's browser via a crafted payload.

CVSS v3
5.4
EG Score
6.1MEDIUMhigh confidence
EG Risk
43
EG Risk 43/100CISA 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
Severity61% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* 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, and watch the vendor's advisory for the fix.
EPSS PROB
0.2%
EPSS %ILE
4th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* 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, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (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 29, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

CVE-2026-88420: Stored XSS via the Markdown field in APSL Puput · GitHub

https://gist.github.com/itsmohitnarayan/89de718efb225e840719478ed949bd51

Vendor Advisories for CVE-2026-88420(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 21× in last 7d / 26× 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. 2026-10-03 20:44 UTCEG score recompute
  2. 2026-10-03 20:44 UTCGHSA enrichment
  3. 2026-10-02 19:46 UTCEG score recompute
  4. 2026-10-02 19:46 UTCGHSA enrichment
  5. 2026-10-01 19:51 UTCEPSS rescore
  6. 2026-10-01 18:47 UTCGHSA enrichment
  7. 2026-09-30 17:43 UTCEG score recompute
  8. 2026-09-30 17:43 UTCGHSA enrichment
  9. 2026-09-30 15:04 UTCEPSS rescore
  10. 2026-09-29 16:45 UTCGHSA enrichment
  11. 2026-09-29 15:58 UTCEG score recompute
  12. 2026-09-29 15:58 UTCGHSA enrichment
  13. 2026-09-29 15:58 UTCMITRE cvelistV5CVSS v3 → 5.4
  14. 2026-09-29 04:32 UTCEG score recompute
  15. 2026-09-29 04:32 UTCGHSA enrichment
  16. 2026-09-29 03:21 UTCEG score recompute▲ 6.10
  17. 2026-09-29 03:21 UTCGHSA enrichment
  18. 2026-09-29 03:20 UTCMITRE cvelistV5CVSS v3 → 6.1 · severity → MEDIUM
  19. 2026-09-28 19:46 UTCEG score recompute
  20. 2026-09-28 19:46 UTCGHSA enrichment
  21. 2026-09-28 13:52 UTCEPSS rescore
  22. 2026-09-27 13:48 UTCEPSS rescore
  23. 2026-09-26 15:59 UTCEPSS rescore
  24. 2026-09-25 13:18 UTCNVD update
  25. 2026-09-25 12:54 UTCEG score recompute
Show 1 more
  1. 2026-09-25 12:54 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-88420?
CVE-2026-88420 is a medium vulnerability published on September 25, 2026. A reflected cross-site scripting (XSS) vulnerability in the EntryAbstract.save() component of APSL puput v1.2.1 through v2.2.0 allows authenticated attackers with Wagtail Editor privileges to execute arbitrary code in the context of the victim's browser via a crafted payload.
When was CVE-2026-88420 disclosed?
CVE-2026-88420 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-2026-88420 actively exploited?
CVE-2026-88420 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (4th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-88420?
CVE-2026-88420 has a CVSS v3.1 base score of 5.4 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 6.1 (MEDIUM).
How do I remediate CVE-2026-88420?
No fix for CVE-2026-88420 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-2026-88420 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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