CVE-2026-45793

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.8%, top 46% 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
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.0%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Composer is a dependency Manager for the PHP language. Prior to 1.10.28, 2.2.28, and 2.9.8, Composer\IO\BaseIO::loadConfiguration() validates GitHub OAuth tokens with the regex ^[.A-Za-z0-9_]+$ and interpolates rejected tokens into an UnexpectedValueException; GitHub Actions GITHUB_TOKEN values using the ghs__ format can contain -, fail validation, and be disclosed to stderr or CI logs. This issue is fixed in versions 1.10.28, 2.2.28, and 2.9.8.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

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
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
EPSS PROB
1.0%
EPSS %ILE
62nd
KEV
Not listed

Published

May 19, 2026

Last Modified

July 15, 2026

Advisory Details (9)

Auto-updated Jul 15, 2026
Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available

2.9.8

Patch available: composer/composer 2.9.8

https://github.com/composer/composer/releases/tag/2.9.8
github_release Patch Available

2.2.28

Patch available: composer/composer 2.2.28

https://github.com/composer/composer/releases/tag/2.2.28
github_release Patch Available

1.10.28

Patch available: composer/composer 1.10.28

https://github.com/composer/composer/releases/tag/1.10.28
github_commit Patch Available

commit e66c8fdb7ff5 (composer/composer)

Patch available: composer/composer 1.10.28 (contains commit e66c8fdb7ff5)

https://github.com/composer/composer/commit/e66c8fdb7ff5409bd2f358c5f194038e49e93714
github_commit Patch Available

commit 65e6390c49f1 (composer/composer)

Patch available: composer/composer 2.2.28 (contains commit 65e6390c49f1)

https://github.com/composer/composer/commit/65e6390c49f1a11cd8b660d81822086db51fe2d1
github_commit Patch Available

commit 3f5e7f9fbfa5 (composer/composer)

Patch available: composer/composer 2.9.8 (contains commit 3f5e7f9fbfa5)

https://github.com/composer/composer/commit/3f5e7f9fbfa541137d6d1d5643ec3b718e9d5039
github_pr Patch Available

Fix regexp for new GitHub installation tokens (1.10)

Patch available: composer/composer 1.10.28 (PR #12855 merged 2026-05-13)

https://github.com/composer/composer/pull/12855
github_pr Patch Available

Fix regexp for new GitHub installation tokens

Patch available: composer/composer 2.9.8 (PR #12853 merged 2026-05-13)

https://github.com/composer/composer/pull/12853
githubMentions a patch (unverified)

Github Actions issued GITHUB_TOKEN disclosure in GitHub Actions logs · Advisory · composer/composer · GitHub

https://github.com/composer/composer/security/advisories/GHSA-f9f8-rm49-7jv2

Vendor Advisories for CVE-2026-45793(1)

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

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
composer2.0.11-1 ... 2.9.8-1 (96 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
composer2.5.5-1, 2.5.5-1+deb12u1, 2.5.5-1+deb12u2, 2.5.5-1+deb12u3, 2.5.5-1+deb12u4
  • every version up to 2.5.5-1+deb12u5: fixed in 2.5.5-1+deb12u5
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
composer2.8.8-1, 2.8.8-1+deb13u1, 2.8.8-1+deb13u2
  • every version up to 2.8.8-1+deb13u3: fixed in 2.8.8-1+deb13u3
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
composer2.10.0~rc1-1 ... 2.9.8-1 (18 versions)
  • every version up to 2.10.0-1: fixed in 2.10.0-1
—
Packagist(1)
PackageVulnerable rangeFix by version rangeDependents
composer/composer1.0.0 ... 1.9.3 (96 versions)
  • 2.3.0 up to 2.9.8: fixed in 2.9.8
  • 2.0.0 up to 2.2.28: fixed in 2.2.28
  • 1.0 up to 1.10.28: fixed in 1.10.28
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 23× 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. 2026-10-07 23:48 UTCEPSS rescore
  2. 2026-10-06 15:18 UTCEPSS rescore
  3. 2026-10-05 17:43 UTCEPSS rescore
  4. 2026-10-04 23:22 UTCEPSS rescore
  5. 2026-10-03 14:25 UTCEPSS rescore
  6. 2026-10-01 19:50 UTCEPSS rescore
  7. 2026-09-30 15:03 UTCEPSS rescore
  8. 2026-09-30 03:39 UTCOSV refresh
  9. 2026-09-27 13:48 UTCEPSS rescore
  10. 2026-09-26 15:58 UTCEPSS rescore
  11. 2026-09-23 17:53 UTCEPSS rescore
  12. 2026-09-20 20:15 UTCEPSS rescore
  13. 2026-09-18 19:28 UTCEPSS rescore
  14. 2026-09-17 19:31 UTCEPSS rescore
  15. 2026-09-16 14:08 UTCEPSS rescore
  16. 2026-09-16 05:15 UTCEPSS rescore
  17. 2026-09-13 16:47 UTCEPSS rescore
  18. 2026-09-12 15:01 UTCEPSS rescore
  19. 2026-09-11 14:53 UTCEPSS rescore
  20. 2026-09-11 09:37 UTCEPSS rescore
  21. 2026-09-11 05:53 UTCOSV refresh
  22. 2026-09-10 09:34 UTCEPSS rescore
  23. 2026-09-08 22:00 UTCEPSS rescore
  24. 2026-09-07 16:01 UTCEPSS rescore
  25. 2026-09-06 13:47 UTCEPSS rescore
Show 70 more
  1. 2026-09-04 05:06 UTCEPSS rescore
  2. 2026-09-02 14:12 UTCEPSS rescore
  3. 2026-09-01 13:54 UTCEPSS rescore
  4. 2026-08-30 19:17 UTCEPSS rescore
  5. 2026-08-30 01:22 UTCEPSS rescore
  6. 2026-08-28 21:41 UTCEPSS rescore
  7. 2026-08-27 14:25 UTCEPSS rescore
  8. 2026-08-26 14:46 UTCEPSS rescore
  9. 2026-08-25 13:49 UTCEPSS rescore
  10. 2026-08-23 17:00 UTCEG score recompute
  11. 2026-08-23 00:19 UTCEPSS rescore
  12. 2026-08-21 23:49 UTCEPSS rescore
  13. 2026-08-21 23:37 UTCEG score recompute
  14. 2026-08-20 22:55 UTCEPSS rescore
  15. 2026-08-20 19:01 UTCEG score recompute
  16. 2026-08-19 17:04 UTCEPSS rescore
  17. 2026-08-18 13:48 UTCEPSS rescore
  18. 2026-08-17 13:47 UTCEPSS rescore
  19. 2026-08-16 16:59 UTCEG score recompute
  20. 2026-08-16 14:56 UTCEPSS rescore
  21. 2026-08-16 03:34 UTCEG score recompute
  22. 2026-08-16 02:14 UTCEPSS rescore
  23. 2026-08-15 01:37 UTCEG score recompute
  24. 2026-08-15 01:30 UTCEPSS rescore
  25. 2026-08-14 02:06 UTCEG score recompute
  26. 2026-08-13 22:00 UTCEPSS rescore
  27. 2026-08-12 14:22 UTCEG score recompute
  28. 2026-08-12 13:51 UTCEPSS rescore
  29. 2026-08-11 13:53 UTCEG score recompute
  30. 2026-08-11 00:39 UTCEG score recompute
  31. 2026-08-11 00:00 UTCEPSS rescore
  32. 2026-08-10 01:07 UTCEG score recompute
  33. 2026-08-09 13:46 UTCEPSS rescore
  34. 2026-08-09 01:35 UTCEG score recompute
  35. 2026-08-08 16:37 UTCEPSS rescore
  36. 2026-08-07 20:25 UTCEG score recompute
  37. 2026-08-06 20:53 UTCEG score recompute
  38. 2026-08-06 13:47 UTCEPSS rescore
  39. 2026-08-05 21:21 UTCEG score recompute
  40. 2026-08-05 19:17 UTCEPSS rescore
  41. 2026-08-04 15:10 UTCEPSS rescore
  42. 2026-08-04 10:39 UTCEPSS rescore
  43. 2026-08-03 16:58 UTCEG score recompute
  44. 2026-08-03 10:36 UTCEPSS rescore
  45. 2026-08-02 05:40 UTCEG score recompute
  46. 2026-08-02 02:27 UTCEPSS rescore
  47. 2026-08-01 17:54 UTCEG score recompute
  48. 2026-08-01 04:16 UTCEPSS rescore
  49. 2026-07-30 16:28 UTCEPSS rescore
  50. 2026-07-30 01:30 UTCEPSS rescore
  51. 2026-07-28 15:36 UTCEPSS rescore
  52. 2026-07-27 14:13 UTCEPSS rescore
  53. 2026-07-26 14:54 UTCEPSS rescore
  54. 2026-07-26 14:54 UTCEPSS rescore
  55. 2026-07-25 14:18 UTCEPSS rescore
  56. 2026-07-24 14:17 UTCEPSS rescore
  57. 2026-07-23 14:18 UTCEPSS rescore
  58. 2026-07-23 03:16 UTCEG score recompute
  59. 2026-07-22 14:08 UTCEPSS rescore
  60. 2026-07-21 15:24 UTCEPSS rescore
  61. 2026-07-20 17:08 UTCEPSS rescore
  62. 2026-07-19 14:31 UTCEPSS rescore
  63. 2026-07-19 02:29 UTCEPSS rescore
  64. 2026-07-18 10:04 UTCEPSS rescore
  65. 2026-07-17 23:29 UTCOSV refresh
  66. 2026-07-16 17:03 UTCEPSS rescore
  67. 2026-06-14 23:18 UTCEPSS rescore
  68. 2026-06-13 23:00 UTCEPSS rescore
  69. 2026-06-12 23:12 UTCEPSS rescore
  70. 2026-05-24 06:13 UTCEG score recompute

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-45793?
CVE-2026-45793 is a high vulnerability published on May 19, 2026. Composer is a dependency Manager for the PHP language. Prior to 1.10.28, 2.2.28, and 2.9.8, Composer\IO\BaseIO::loadConfiguration() validates GitHub OAuth tokens with the regex ^[.A-Za-z0-9]+$ and interpolates rejected tokens into an UnexpectedValueException; GitHub Actions GITHUBTOKEN values using…
When was CVE-2026-45793 disclosed?
CVE-2026-45793 was first published on May 19, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45793 actively exploited?
CVE-2026-45793 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.0% probability of exploitation in the next 30 days (62nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-45793?
CVE-2026-45793 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-45793?
A fix for CVE-2026-45793 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-45793 are linked in the Vendor Advisories panel on this page.

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