CVE-2026-77634

HIGHPre-NVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 76% 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
Trending — 3 sources updated this week
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.2Exploit: None knownExposed: 0

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

CakePHP is a rapid development framework for PHP. Prior to versions 4.5.12, 4.6.5, 5.1.8, 5.2.14, and 5.3.7 on their respective release lines, custom mail headers added with Message::setHeaders() or Message::addHeaders() do not have CRLF bytes removed, allowing header injection when user-controlled data is used in message headers. This issue is fixed in versions 4.5.12, 4.6.5, 5.1.8, 5.2.14, and 5.3.7.

CVSS v3
8.2
EG Score
8.2(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity82% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
24%
KEV
Not listed

Published

August 24, 2026

Last Modified

August 25, 2026

Advisory Details (5)

Auto-updated Aug 24, 2026
Patch available. Sources: github_commit, github.
github Patch Available

SmtpTransport vulnerable to CRLF header injection · Advisory · cakephp/cakephp · GitHub

https://github.com/cakephp/cakephp/security/advisories/GHSA-2qh5-382h-3jpc
github_commit Patch Available

commit b67b62245736 (cakephp/cakephp)

Patch available: cakephp/cakephp 4.5.12 (contains commit b67b62245736)

https://github.com/cakephp/cakephp/commit/b67b622457362b075bb37e625a82af73a0b3c9c3
github_commit Patch Available

commit 3e09dae6cbdc (cakephp/cakephp)

Patch available: cakephp/cakephp 5.4.0-RC2 (contains commit 3e09dae6cbdc)

https://github.com/cakephp/cakephp/commit/3e09dae6cbdc983754fa3a8e6aae74da102a3ea1
github_commit Patch Available

commit 2afe42b02d8d (cakephp/cakephp)

Patch available: cakephp/cakephp 5.1.8 (contains commit 2afe42b02d8d)

https://github.com/cakephp/cakephp/commit/2afe42b02d8ddc5d442bca5e8bb61910a727646e
github_commit Patch Available

commit 08188962bcd9 (cakephp/cakephp)

Patch available: cakephp/cakephp 4.6.5 (contains commit 08188962bcd9)

https://github.com/cakephp/cakephp/commit/08188962bcd99a95da1e49f62e786f2d688f1e41

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 14× 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. 2026-08-30 05:28 UTCEG score recompute
  2. 2026-08-30 01:22 UTCEPSS rescore
  3. 2026-08-29 06:08 UTCEG score recompute
  4. 2026-08-28 21:42 UTCEPSS rescore
  5. 2026-08-27 19:00 UTCEG score recompute
  6. 2026-08-27 14:25 UTCEPSS rescore
  7. 2026-08-26 19:41 UTCEG score recompute
  8. 2026-08-26 14:47 UTCEPSS rescore
  9. 2026-08-25 20:24 UTCEG score recompute
  10. 2026-08-25 19:37 UTCEG score recompute
  11. 2026-08-25 13:49 UTCEPSS rescore
  12. 2026-08-24 21:26 UTCEG score recompute
  13. 2026-08-24 20:36 UTCEG score recompute
  14. 2026-08-24 20:36 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-77634?
CVE-2026-77634 is a high vulnerability published on August 24, 2026. CakePHP is a rapid development framework for PHP. Prior to versions 4.5.12, 4.6.5, 5.1.8, 5.2.14, and 5.3.7 on their respective release lines, custom mail headers added with Message::setHeaders() or Message::addHeaders() do not have CRLF bytes removed, allowing header injection when user-controlled…
When was CVE-2026-77634 disclosed?
CVE-2026-77634 was first published in the National Vulnerability Database on August 24, 2026, with the most recent update on August 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77634 actively exploited?
CVE-2026-77634 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 76.5% of all scored CVEs.
What is the CVSS score of CVE-2026-77634?
CVE-2026-77634 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-77634?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77634, 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.

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