CVE-2026-55824

LOWPre-NVD 2.62.6
EchelonGraph scoreMEDIUM confidence

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

Score 2.6 from GitHub Security Advisory (severity: LOW) published 2026-08-06. A secondary CVSS source baseline 2.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 4 sources updated this week

Also known asEUVD-2026-51613 (ENISA EUVD) · GHSA-3mr9-p497-58f6 (GitHub Security Advisories)Source: ENISA EUVD

2.6EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 2.6Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Contao is an Open Source CMS. In versions 4.13.40 through 5.3.46 and 5.7.0-RC1 through 5.7.6, the crawler leaks auth credentials to external hosts. Contao's crawler tries to prevent confidential HTTP client options from being sent to external domains by creating a scoped client: full options for root page origins, cleaned options for everything else. The cleaner removes Cookie and Authorization headers, but it removes the non-Symfony option names basic_auth and bearer_auth instead of Symfony HttpClient's real auth_basic and auth_bearer options. When contao.crawl.default_http_client_options contains Basic or Bearer authentication for a protected staging/production site, those credentials remain in the "clean" client used for external links or configured additional URIs. An attacker who can get an external URL crawled, for example through a link on a crawled page while the broken-link checker is enabled, can receive the crawler credentials. This issue has been fixed in versions 5.3.47 and 5.7.7.

CVSS v3
2.6
EG Score
2.6LOWmedium confidence
EG Risk
12
EG Risk 12/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity26% × 45%
Impact severity (EG Severity): CVSS 2.6 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.2% × 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
0.2%
EPSS %ILE
15th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (2.6): severity, escalated by confirmed exploitation. This CVE's 2.6 is its impact severity (EG Severity), not escalated.

EG Severity
2.6 LOWCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

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.

The score's inputs: 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

July 31, 2026

Last Modified

September 8, 2026

Vendor Advisories for CVE-2026-55824(1)

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

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
composercontao/contao @ 5.3.47 (fixes >= 4.13.0, < 5.3.47)—ghsa
composercontao/contao @ 5.7.7 (fixes >= 5.4.0, < 5.7.7)—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(2 across 1 ecosystem)
Packagist(2)
PackageVulnerable rangeFix by version rangeDependents
contao/contao5.4.0 ... 5.7.6 (62 versions)
  • 4.13.0 up to 5.3.47: fixed in 5.3.47
  • 5.4.0 up to 5.7.7: fixed in 5.7.7
—
contao/core-bundle5.4.0 ... 5.7.6 (62 versions)
  • 4.13.0 up to 5.3.47: fixed in 5.3.47
  • 5.4.0 up to 5.7.7: fixed in 5.7.7
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 41× 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.

Showing the most recent 100 of 113 refreshes on record for this CVE.

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. None are among the latest 100 rows. The 13 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  2. 2026-11-01 07:43 UTCGHSA enrichmentGHSA-3mr9-p497-58f6 · GitHub severity LOW · GitHub CVSS 2.6
  3. 2026-11-01 07:43 UTCEG score recompute
  4. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  5. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  6. 2026-10-29 17:20 UTCEG score recompute
  7. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  8. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  9. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  10. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  11. 2026-10-26 13:25 UTCOSV refresh
  12. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  13. 2026-10-25 14:18 UTCEG score recompute
  14. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  15. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  16. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  17. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  18. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  19. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  20. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  21. 2026-10-18 03:29 UTCEG score recompute
  22. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  23. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  24. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  25. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.2% · 14th percentile
Show 75 more
  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  3. 2026-10-12 15:55 UTCEG score recompute
  4. 2026-10-11 19:38 UTCEG score recompute
  5. 2026-10-11 16:53 UTCEG score recompute
  6. 2026-10-11 14:16 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  14. 2026-10-04 23:50 UTCEG score recompute
  15. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  16. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  17. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  18. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  19. 2026-10-01 16:04 UTCEG score recompute
  20. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  21. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  22. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  23. 2026-09-28 13:15 UTCEG score recompute
  24. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  25. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  26. 2026-09-25 10:25 UTCEG score recompute
  27. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  28. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  29. 2026-09-22 07:36 UTCEG score recompute
  30. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  31. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  32. 2026-09-18 06:11 UTCEG score recompute
  33. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  34. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  35. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  36. 2026-09-15 03:21 UTCEG score recompute
  37. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  38. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  39. 2026-09-12 00:31 UTCEG score recompute
  40. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  41. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  42. 2026-09-08 21:22 UTCEG score recompute
  43. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  44. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  45. 2026-09-05 11:26 UTCEG score recompute
  46. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  47. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  48. 2026-09-02 08:11 UTCEG score recompute
  49. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  50. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  51. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  52. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  53. 2026-08-29 22:18 UTCEG score recompute
  54. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  55. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  56. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  57. 2026-08-25 19:06 UTCEG score recompute
  58. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  59. 2026-08-22 16:16 UTCEG score recompute
  60. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  61. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  62. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  63. 2026-08-19 13:26 UTCEG score recompute
  64. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  65. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  66. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  67. 2026-08-16 10:31 UTCEG score recompute
  68. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  69. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  70. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  71. 2026-08-13 07:42 UTCEG score recompute
  72. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  73. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  74. 2026-08-10 04:52 UTCEG score recompute
  75. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.2% · 5th percentile

Frequently asked(5)

What is CVE-2026-55824?
CVE-2026-55824 is a low-severity vulnerability; its CVE record was published on July 31, 2026. Contao is an Open Source CMS. In versions 4.13.40 through 5.3.46 and 5.7.0-RC1 through 5.7.6, the crawler leaks auth credentials to external hosts. Contao's crawler tries to prevent confidential HTTP client options from being sent to external domains by creating a scoped client: full options for…
When was the CVE record for CVE-2026-55824 published?
The CVE record for CVE-2026-55824 was published on July 31, 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 September 8, 2026; the record at its source may have been updated since.
Is CVE-2026-55824 actively exploited?
CVE-2026-55824 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (15th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55824?
CVE-2026-55824 has a CVSS base score of 2.6 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55824?
A fix for CVE-2026-55824 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55824 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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