CVE-2026-58657

MEDIUMPre-NVD 4.84.8—
EchelonGraph scoreHIGH confidence

Score 4.8 from GitHub Security Advisory published 2026-07-08. a secondary CVSS source baseline 4.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
4.8
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.8Exploit: NoneExposed: 0

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

Grav before 2.0.0 (affected through 2.0.0-rc.9 and the 2.0 branch) contains a stored CSS injection vulnerability in the Markdown image resize() media action. Prior media hardening rejects direct ?style= payloads and unsafe attribute() fallbacks, but the resize() action in Excerpts::processMediaActions() writes caller-controlled values directly into the image's styleAttributes. A lower-privileged content editor who can edit page Markdown can store a crafted image URL with semicolon-delimited CSS declarations in the resize parameters, which are rendered into the final attribute when a higher-privileged reviewer/admin views the page or preview. This does not require JavaScript execution but enables UI redress/overlay and content-manipulation attacks (e.g., a full-viewport fixed overlay). Fixed in 2.0.0.

CVSS v3
4.8
EG Score
4.8(high)
EPSS
12.1%
KEV
Not listed

Published

July 8, 2026

Last Modified

July 8, 2026

Advisory Details (4)

Auto-updated Jul 9, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github.
github Patch Available🟡 PoC Available

Stored CSS injection via Markdown image resize() bypasses prior media style sanitizers in Grav 2.0 · Advisory · getgrav/grav · GitHub

https://github.com/getgrav/grav/security/advisories/GHSA-ffmg-hfvg-jhg9
generic

Grav - Stored CSS Injection via Markdown Image resize() Action | Advisories | VulnCheck

https://www.vulncheck.com/advisories/grav-stored-css-injection-via-markdown-image-resize-action
github_commit Patch Available

commit e03d29aa0d3e (getgrav/grav)

Patch available: getgrav/grav 2.0.0-rc.9 (contains commit e03d29aa0d3e)

https://github.com/getgrav/grav/commit/e03d29aa0d3ece16d73c1ffccfa78df8bf5f28b8
github_commit Patch Available

commit 6582166173bb (getgrav/grav)

Patch available: getgrav/grav 2.0.0-rc.10 (contains commit 6582166173bb)

https://github.com/getgrav/grav/commit/6582166173bb8eb5869d96aea384e0e73777c94c

Vendor Advisories for CVE-2026-58657(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 26× in last 7d / 28× 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. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 16:26 UTCEG score recompute
  4. 2026-07-15 16:26 UTCGHSA enrichment
  5. 2026-07-15 02:00 UTCEPSS rescore
  6. 2026-07-15 02:00 UTCEPSS rescore
  7. 2026-07-14 16:06 UTCEG score recompute
  8. 2026-07-14 16:06 UTCGHSA enrichment
  9. 2026-07-13 22:31 UTCEPSS rescore
  10. 2026-07-13 15:45 UTCEG score recompute
  11. 2026-07-13 15:45 UTCGHSA enrichment
  12. 2026-07-13 06:13 UTCEPSS rescore
  13. 2026-07-13 06:13 UTCEPSS rescore
  14. 2026-07-12 15:25 UTCEG score recompute
  15. 2026-07-12 15:25 UTCGHSA enrichment
  16. 2026-07-12 05:46 UTCEPSS rescore
  17. 2026-07-11 15:05 UTCEG score recompute
  18. 2026-07-11 15:04 UTCGHSA enrichment
  19. 2026-07-11 08:27 UTCEPSS rescore
  20. 2026-07-11 08:27 UTCEPSS rescore
  21. 2026-07-10 14:45 UTCEG score recompute
  22. 2026-07-10 14:45 UTCGHSA enrichment
  23. 2026-07-09 19:10 UTCEPSS rescore
  24. 2026-07-09 19:10 UTCEPSS rescore
  25. 2026-07-09 14:26 UTCEG score recompute
Show 3 more
  1. 2026-07-09 14:25 UTCGHSA enrichment
  2. 2026-07-08 14:06 UTCEG score recompute
  3. 2026-07-08 14:05 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-58657?
CVE-2026-58657 is a medium vulnerability published on July 8, 2026. Grav before 2.0.0 (affected through 2.0.0-rc.9 and the 2.0 branch) contains a stored CSS injection vulnerability in the Markdown image resize() media action. Prior media hardening rejects direct ?style= payloads and unsafe attribute() fallbacks, but the resize() action in…
When was CVE-2026-58657 disclosed?
CVE-2026-58657 was first published in the National Vulnerability Database on July 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-58657 actively exploited?
CVE-2026-58657 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 12.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-58657?
CVE-2026-58657 has a CVSS v3 base score of 4.8 (NVD).
How do I remediate CVE-2026-58657?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58657, 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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