CVE-2026-54163

MEDIUMPre-NVD 4.74.7
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 4.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (19th 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
Elevated
4.7EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 4.7Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

secure_headers manages application of security headers with many safe defaults. Prior to 7.3.0, secure_headers builds the Content-Security-Policy value by stitching directives with ; separators, and build_sandbox_list_directive, build_media_type_list_directive, and build_report_to_directive interpolate caller-supplied strings without scrubbing ;, \r, or \n. When untrusted input reaches SecureHeaders.override_content_security_policy_directives or append APIs for :sandbox, :plugin_types, or :report_to, an attacker can inject a CSP directive such as script-src 'unsafe-inline' * before the legitimate script-src, enabling XSS reachability through these sinks or CSP report exfiltration. This issue is fixed in version 7.3.0.

CVSS v3
4.7
EG Score
4.7MEDIUMmedium 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)
Severity47% × 45%
The EG Score, 4.7 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (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
0.3%
EPSS %ILE
19th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

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

Exploitation public PoC (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

July 10, 2026

Last Modified

July 23, 2026

Advisory Details (3)

Auto-updated Jul 17, 2026
Patch available. Sources: github_release, github, github_commit.
GitHub advisoryMentions a patch (unverified)

CSP directive injection via sandbox, plugin_types, and report_to when given untrusted input · Advisory · github/secure_headers · GitHub

https://github.com/github/secure_headers/security/advisories/GHSA-rqq5-2gf9-4w4q
GitHub release Patch Available

v7.3.0

Patch available: github/secure_headers v7.3.0

https://github.com/github/secure_headers/releases/tag/v7.3.0
GitHub commit Patch Available

commit 286a79dea80c (github/secure_headers)

Patch available: github/secure_headers v7.3.0 (contains commit 286a79dea80c)

https://github.com/github/secure_headers/commit/286a79dea80c6a9be4ca93e0f284c923cf77e539

Vendor Advisories for CVE-2026-54163(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
ruby-secure-headers6.3.2-1, 6.3.2-2, 7.1.0-1, 7.2.0-1, 7.3.0-1
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
ruby-secure-headers6.3.2-1, 6.3.2-2, 7.1.0-1, 7.2.0-1, 7.3.0-1
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
ruby-secure-headers6.3.2-2, 7.1.0-1, 7.2.0-1, 7.3.0-1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
ruby-secure-headers6.3.2-2, 7.1.0-1, 7.2.0-1
  • every version up to 7.3.0-1: fixed in 7.3.0-1
—
RubyGems(1)
PackageVulnerable rangeFix by version rangeDependents
secure_headers0.1.0 ... 7.2.0 (113 versions)
  • every version up to 7.3.0: fixed in 7.3.0
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 34× 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 122 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 22 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  3. 2026-10-12 15:56 UTCEG score recompute
  4. 2026-10-11 19:40 UTCEG score recompute
  5. 2026-10-11 16:55 UTCEG score recompute
  6. 2026-10-11 14:18 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  15. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  16. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  17. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  18. 2026-10-01 14:57 UTCEG score recompute
  19. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  20. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  21. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  22. 2026-09-28 09:46 UTCEG score recompute
  23. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  24. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  25. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.3% · 18th percentile
Show 75 more
  1. 2026-09-24 11:09 UTCEG score recompute
  2. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  3. 2026-09-23 05:44 UTCEG score recompute
  4. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  5. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  6. 2026-09-18 05:17 UTCEG score recompute
  7. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  8. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  9. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  10. 2026-09-14 06:14 UTCEG score recompute
  11. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  12. 2026-09-13 08:10 UTCEG score recompute
  13. 2026-09-12 02:45 UTCEG score recompute
  14. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  15. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  16. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  17. 2026-09-08 02:45 UTCEG score recompute
  18. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  19. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  20. 2026-09-05 21:40 UTCEG score recompute
  21. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  22. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  23. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  24. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  25. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  26. 2026-08-30 06:12 UTCEG score recompute
  27. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  28. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  29. 2026-08-27 23:54 UTCEG score recompute
  30. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  31. 2026-08-27 01:39 UTCEG score recompute
  32. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  33. 2026-08-26 03:32 UTCEG score recompute
  34. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  35. 2026-08-24 21:43 UTCEG score recompute
  36. 2026-08-22 03:31 UTCEG score recompute
  37. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  38. 2026-08-21 04:50 UTCEG score recompute
  39. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  40. 2026-08-20 06:46 UTCEG score recompute
  41. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  42. 2026-08-19 08:42 UTCEG score recompute
  43. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  44. 2026-08-18 10:38 UTCEG score recompute
  45. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  46. 2026-08-17 10:24 UTCEG score recompute
  47. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  48. 2026-08-16 12:20 UTCEG score recompute
  49. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  50. 2026-08-15 14:17 UTCEG score recompute
  51. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  52. 2026-08-14 16:13 UTCEG score recompute
  53. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  54. 2026-08-12 20:05 UTCEG score recompute
  55. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  56. 2026-08-11 22:01 UTCEG score recompute
  57. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  58. 2026-08-10 01:54 UTCEG score recompute
  59. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  60. 2026-08-09 03:51 UTCEG score recompute
  61. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  62. 2026-08-08 05:48 UTCEG score recompute
  63. 2026-08-07 07:44 UTCEG score recompute
  64. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  65. 2026-08-06 09:40 UTCEG score recompute
  66. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  67. 2026-08-05 11:37 UTCEG score recompute
  68. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  69. 2026-08-04 13:32 UTCEG score recompute
  70. 2026-08-04 10:39 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  71. 2026-08-03 14:10 UTCEG score recompute
  72. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  73. 2026-08-02 16:05 UTCEG score recompute
  74. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  75. 2026-08-01 18:01 UTCEG score recompute

Related CVEs(same product + same CWE)

Same product

2 shown

Debian:11:ruby-secure-headers

Frequently asked(5)

What is CVE-2026-54163?
CVE-2026-54163 is a medium-severity vulnerability; its CVE record was published on July 10, 2026. secureheaders manages application of security headers with many safe defaults. Prior to 7.3.0, secureheaders builds the Content-Security-Policy value by stitching directives with ; separators, and buildsandboxlistdirective, buildmediatypelistdirective, and buildreporttodirective interpolate…
When was the CVE record for CVE-2026-54163 published?
The CVE record for CVE-2026-54163 was published on July 10, 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 July 23, 2026; the record at its source may have been updated since.
Is CVE-2026-54163 actively exploited?
CVE-2026-54163 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (19th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-54163?
CVE-2026-54163 has a CVSS base score of 4.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-54163?
A fix for CVE-2026-54163 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-54163 are linked in the Vendor Advisories panel on this page.

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