CVE-2026-77634

HIGHPre-NVD 8.28.2
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This high-severity CVE scores 8.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (44th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
8.2EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.2Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
8.2HIGHmedium confidence
EG Risk
37
EG Risk 37/100

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 (value × EchelonGraph’s weight)
Severity82% × 45%
The EG Score, 8.2 of 10.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
44th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 24, 2026

Last Modified

October 12, 2026

Advisory Details (5)

Auto-updated Aug 24, 2026
Patch available. Sources: github_commit, github.
GitHub advisoryMentions a patch (unverified)

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

Vendor Advisories for CVE-2026-77634(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 2 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
cakephp2.10.11-2.1, 2.10.24-1, 2.10.24-2
  • every version on: no fix on record
—
Packagist(1)
PackageVulnerable rangeFix by version rangeDependents
cakephp/cakephp5.3.0 ... 5.3.6 (7 versions)
  • 4.5.0 up to 4.5.12: fixed in 4.5.12
  • 4.6.0 up to 4.6.5: fixed in 4.6.5
  • 5.0.0 up to 5.1.9: fixed in 5.1.9
  • 5.2.0 up to 5.2.14: fixed in 5.2.14
  • 5.3.0 up to 5.3.7: fixed in 5.3.7
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 56× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 3 repeat rows among the latest 95 are merged into the row they repeat.

  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  2. 2026-10-12 21:25 UTCEG score recompute
  3. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  4. 2026-10-12 15:37 UTCEG score recompute
  5. 2026-10-11 19:23 UTCEG score recompute
  6. 2026-10-11 16:39 UTCEG score recompute
  7. 2026-10-11 13:57 UTCEG score recompute
  8. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  9. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  10. 2026-10-10 12:29 UTCEG score recompute
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  12. 2026-10-09 04:41 UTCEG score recompute
  13. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  14. 2026-10-08 03:49 UTCEG score recompute
  15. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  16. 2026-10-06 19:23 UTCEG score recompute
  17. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  18. 2026-10-06 07:44 UTCEG score recompute
  19. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  20. 2026-10-05 04:45 UTCEG score recompute
  21. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  22. 2026-10-03 16:30 UTCEG score recompute
  23. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  24. 2026-10-02 20:58 UTCEG score recompute
  25. 2026-10-01 21:00 UTCEG score recompute
Show 67 more
  1. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  2. 2026-09-30 20:17 UTCEG score recompute
  3. 2026-09-30 06:58 UTCEG score recompute
  4. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  5. 2026-09-28 21:32 UTCEG score recompute
  6. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  7. 2026-09-27 21:33 UTCEG score recompute
  8. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  9. 2026-09-26 22:16 UTCEG score recompute
  10. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  11. 2026-09-26 00:28 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  12. 2026-09-24 19:16 UTCEG score recompute
  13. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  14. 2026-09-23 19:58 UTCEG score recompute
  15. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  16. 2026-09-22 19:10 UTCEG score recompute
  17. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  18. 2026-09-22 07:20 UTCEG score recompute
  19. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  20. 2026-09-20 20:24 UTCEG score recompute
  21. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  22. 2026-09-19 20:55 UTCEG score recompute
  23. 2026-09-18 21:34 UTCEG score recompute
  24. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  25. 2026-09-17 21:11 UTCEG score recompute
  26. 2026-09-16 19:30 UTCEG score recompute
  27. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  28. 2026-09-16 06:23 UTCEG score recompute
  29. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  30. 2026-09-15 06:41 UTCEG score recompute
  31. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  32. 2026-09-13 18:57 UTCEG score recompute
  33. 2026-09-12 19:31 UTCEG score recompute
  34. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  35. 2026-09-11 20:12 UTCEG score recompute
  36. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  37. 2026-09-10 20:44 UTCEG score recompute
  38. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  39. 2026-09-09 01:21 UTCEG score recompute
  40. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  41. 2026-09-06 13:58 UTCEG score recompute
  42. 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  43. 2026-09-06 02:19 UTCEG score recompute
  44. 2026-09-04 15:21 UTCEG score recompute
  45. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  46. 2026-09-02 16:27 UTCEG score recompute
  47. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  48. 2026-09-01 17:07 UTCEG score recompute
  49. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  50. 2026-09-01 05:24 UTCEG score recompute
  51. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  52. 2026-08-31 04:46 UTCEG score recompute
  53. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  54. 2026-08-30 05:28 UTCEG score recompute
  55. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  56. 2026-08-29 06:08 UTCEG score recompute
  57. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  58. 2026-08-27 19:00 UTCEG score recompute
  59. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  60. 2026-08-26 19:41 UTCEG score recompute
  61. 2026-08-26 14:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  62. 2026-08-25 20:24 UTCEG score recompute
  63. 2026-08-25 19:37 UTCEG score recompute
  64. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  65. 2026-08-24 21:26 UTCEG score recompute
  66. 2026-08-24 20:36 UTCEG score recomputeFirst assessed: 8.2 HIGH
  67. 2026-08-24 20:36 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-77634?
CVE-2026-77634 is a high-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-77634 published?
The CVE record for CVE-2026-77634 was published on August 24, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 12, 2026; the record at its source may have been updated since.
Is CVE-2026-77634 actively exploited?
CVE-2026-77634 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-77634?
CVE-2026-77634 has a CVSS base score of 8.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-77634?
A fix for CVE-2026-77634 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-77634 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-77634

Explore →

Is Your Infrastructure Affected by CVE-2026-77634?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs