CVE-2026-7808

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-23. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

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

justhtml before 1.16.0 contains multiple HTML sanitization bypass issues that can allow active/dangerous content (e.g., script or style) to survive sanitization, potentially leading to cross-site scripting. The issues primarily affect advanced usage rather than the default JustHTML(..., sanitize=True) path for ordinary parsed HTML: mutating or reusing sanitization policy objects (including exported defaults) could weaken later sanitization; programmatic DOM input to sanitize()/sanitize_dom() could miss mixed-case tag names (e.g., ScRiPt, StYlE); crafted programmatic doctype names could serialize into active markup; and custom policies preserving SVG or MathML could allow animation elements, presentation attributes with external url(...) references, or DOM trees mislabeled as namespace="html" to bypass foreign-content checks. Fixed in 1.16.0.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
28%
KEV
Not listed

Published

August 23, 2026

Last Modified

August 26, 2026

Advisory Details (2)

Auto-updated Aug 26, 2026
Patch available. Sources: github.
generic

justhtml before 1.16.0 Multiple Security Issues via Sanitization | Advisories | VulnCheck

https://www.vulncheck.com/advisories/justhtml-before-multiple-security-issues-via-sanitization
github Patch Available

Multiple security fixes in justhtml 1.15.0 found by LLM · Advisory · EmilStenstrom/justhtml · GitHub

https://github.com/EmilStenstrom/justhtml/security/advisories/GHSA-4p64-v8f5-r2gx

Vendor Advisories for CVE-2026-7808(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
justhtml0.1.0 ... 1.9.1 (60 versions)1.16.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 33× in last 7d / 33× 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. 2026-08-26 17:24 UTCGHSA enrichment
  2. 2026-08-26 14:54 UTCEG score recompute
  3. 2026-08-26 14:54 UTCGHSA enrichment
  4. 2026-08-26 14:47 UTCEPSS rescore
  5. 2026-08-26 10:59 UTCGHSA enrichment
  6. 2026-08-26 07:03 UTCGHSA enrichment
  7. 2026-08-26 03:07 UTCGHSA enrichment
  8. 2026-08-25 23:10 UTCGHSA enrichment
  9. 2026-08-25 18:55 UTCGHSA enrichment
  10. 2026-08-25 15:00 UTCEG score recompute
  11. 2026-08-25 15:00 UTCGHSA enrichment
  12. 2026-08-25 13:49 UTCEPSS rescore
  13. 2026-08-25 11:05 UTCGHSA enrichment
  14. 2026-08-25 07:10 UTCGHSA enrichment
  15. 2026-08-25 03:15 UTCGHSA enrichment
  16. 2026-08-24 23:21 UTCGHSA enrichment
  17. 2026-08-24 19:25 UTCEG score recompute
  18. 2026-08-24 19:25 UTCGHSA enrichment
  19. 2026-08-24 18:31 UTCEG score recompute
  20. 2026-08-24 18:31 UTCGHSA enrichment
  21. 2026-08-24 17:49 UTCEG score recompute
  22. 2026-08-24 17:49 UTCGHSA enrichment
  23. 2026-08-24 14:18 UTCEPSS rescore
  24. 2026-08-24 13:55 UTCGHSA enrichment
  25. 2026-08-24 10:00 UTCGHSA enrichment
Show 8 more
  1. 2026-08-24 06:05 UTCGHSA enrichment
  2. 2026-08-24 02:10 UTCGHSA enrichment
  3. 2026-08-23 22:11 UTCGHSA enrichment
  4. 2026-08-23 18:16 UTCEG score recompute
  5. 2026-08-23 18:16 UTCGHSA enrichment
  6. 2026-08-23 14:20 UTCEG score recompute
  7. 2026-08-23 13:51 UTCEG score recompute
  8. 2026-08-23 13:50 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-7808?
CVE-2026-7808 is a critical vulnerability published on August 23, 2026. justhtml before 1.16.0 contains multiple HTML sanitization bypass issues that can allow active/dangerous content (e.g., script or style) to survive sanitization, potentially leading to cross-site scripting. The issues primarily affect advanced usage rather than the default JustHTML(...,…
When was CVE-2026-7808 disclosed?
CVE-2026-7808 was first published in the National Vulnerability Database on August 23, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-7808 actively exploited?
CVE-2026-7808 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 72.1% of all scored CVEs.
What is the CVSS score of CVE-2026-7808?
CVE-2026-7808 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-7808?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-7808, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-7808

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