CVE-2026-52846

MEDIUMPre-NVD 4.24.2—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 95% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
4.2
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.2Exploit: NoneExposed: 0

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

Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, Caddy’s stripHTML template function cannot reliably remove all HTML tags from input strings. Certain malformed HTML, such as <<>img src=x onerror=alert()>, can bypass the tag-stripping logic, potentially leaving dangerous content in the output if it is later rendered as HTML. This may allow client-side XSS in cases where untrusted strings are rendered unsafely. This vulnerability is fixed in 2.11.4.

CVSS v3
4.2
EG Score
4.2(medium)
EPSS
4.9%
KEV
Not listed

Published

June 16, 2026

Last Modified

June 29, 2026

Advisory Details (1)

Auto-updated Jun 23, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

stripHTML template function bypass in github.com/caddyserver/caddy · Advisory · caddyserver/caddy · GitHub

https://github.com/caddyserver/caddy/security/advisories/GHSA-vcc4-2c75-vc9v

Vendor Advisories for CVE-2026-52846(1)

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

Affected Packages

(2 across 1 ecosystem)
Go(2)
PackageVulnerable rangeFixed inDependents
github.com/caddyserver/caddy———
github.com/caddyserver/caddy/v2—2.11.4—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× 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. 2026-07-06 22:58 UTCEG score recompute
  2. 2026-07-06 16:27 UTCEPSS rescore
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-05 10:47 UTCEG score recompute
  5. 2026-07-05 02:30 UTCEPSS rescore
  6. 2026-07-04 08:59 UTCEG score recompute
  7. 2026-07-04 06:31 UTCEPSS rescore
  8. 2026-07-03 01:03 UTCEG score recompute
  9. 2026-07-01 23:15 UTCEG score recompute
  10. 2026-07-01 15:07 UTCEPSS rescore
  11. 2026-06-30 23:22 UTCEPSS rescore
  12. 2026-06-30 21:29 UTCEG score recompute
  13. 2026-06-29 19:41 UTCEG score recompute
  14. 2026-06-29 14:06 UTCEPSS rescore
  15. 2026-06-29 14:06 UTCEPSS rescore
  16. 2026-06-28 17:54 UTCEG score recompute
  17. 2026-06-28 14:07 UTCEPSS rescore
  18. 2026-06-28 04:56 UTCEPSS rescore
  19. 2026-06-28 04:56 UTCEPSS rescore
  20. 2026-06-27 16:06 UTCEG score recompute
  21. 2026-06-27 03:08 UTCEPSS rescore
  22. 2026-06-26 14:18 UTCEG score recompute
  23. 2026-06-25 13:49 UTCEPSS rescore
  24. 2026-06-25 12:32 UTCEG score recompute
  25. 2026-06-24 14:05 UTCEPSS rescore
Show 8 more
  1. 2026-06-24 10:45 UTCEG score recompute
  2. 2026-06-23 08:55 UTCEG score recompute
  3. 2026-06-22 07:08 UTCEG score recompute
  4. 2026-06-21 05:06 UTCEG score recompute
  5. 2026-06-20 03:18 UTCEG score recompute
  6. 2026-06-19 01:23 UTCEG score recompute
  7. 2026-06-17 23:33 UTCEG score recompute
  8. 2026-06-16 21:44 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-52846?
CVE-2026-52846 is a medium vulnerability published on June 16, 2026. Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, Caddy’s stripHTML template function cannot reliably remove all HTML tags from input strings. Certain malformed HTML, such as <<>img src=x onerror=alert()>, can bypass the tag-stripping logic, potentially leaving…
When was CVE-2026-52846 disclosed?
CVE-2026-52846 was first published in the National Vulnerability Database on June 16, 2026, with the most recent update on June 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-52846 actively exploited?
CVE-2026-52846 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-52846?
CVE-2026-52846 has a CVSS v3 base score of 4.2 (NVD).
How do I remediate CVE-2026-52846?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-52846, 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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