CVE-2026-63135

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: 0.4% (35th 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
8.2EG
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: 0.4%CVSS: 8.2Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

YOURLS is a self-hosted, customizable URL shortener written in PHP. From 1.5.1 until 1.10.4, YOURLS stores the HTTP Referer header through yourls_get_referrer(), yourls_sanitize_url_safe(), and yourls_log_redirect(), then aggregates the value in yourls-infos.php and passes the derived domain through yourls_get_domain(), yourls_stats_pie(), and yourls_google_array_to_data_table(). The chart builder concatenates labels into inline JavaScript without JavaScript-string escaping, so an unauthenticated attacker can poison the statistics of an existing short URL with a crafted referrer. When an administrator or public stats-page viewer opens the affected statistics page, attacker-controlled JavaScript executes in the YOURLS origin and can access admin-visible data, the API signature token, and privileged same-origin actions. This issue is fixed in version 1.10.4.

CVSS v3
8.2
EG Score
8.2HIGHmedium confidence
EG Risk
53
EG Risk 53/100

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.
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
0.4%
EPSS %ILE
35th
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

August 21, 2026

Last Modified

September 9, 2026

Advisory Details (4)

Auto-updated Aug 21, 2026
Patch available. Sources: github_release, github, github_pr, github_commit.
GitHub release Patch Available

1.10.4

Patch available: YOURLS/YOURLS 1.10.4

https://github.com/YOURLS/YOURLS/releases/tag/1.10.4
GitHub commit Patch Available

commit e1e934766551 (YOURLS/YOURLS)

Patch available: YOURLS/YOURLS 1.10.4 (contains commit e1e934766551)

https://github.com/YOURLS/YOURLS/commit/e1e93476655107e6caab34e52259eb1c91079ec7
GitHub pull request Patch Available

Prevent XSS in stat pages through referrers

Patch available: YOURLS/YOURLS 1.10.4 (PR #4107 merged 2026-05-21)

https://github.com/YOURLS/YOURLS/pull/4107
GitHub advisoryMentions a patch (unverified)

Stored XSS in referrer statistics chart via crafted Referer header · Advisory · YOURLS/YOURLS · GitHub

https://github.com/YOURLS/YOURLS/security/advisories/GHSA-5h77-88j3-r659

Vendor Advisories for CVE-2026-63135(1)

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

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFix by version rangeDependents
yourls/yourls1.10.0 ... 1.9.2 (17 versions)
  • 1.5.1 up to 1.10.4: fixed in 1.10.4
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 49× 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.

  1. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  2. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  3. 2026-10-13 12:04 UTCEG score recompute
  4. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  5. 2026-10-12 15:49 UTCEG score recompute
  6. 2026-10-11 19:33 UTCEG score recompute
  7. 2026-10-11 16:48 UTCEG score recompute
  8. 2026-10-11 14:10 UTCEG score recompute
  9. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  12. 2026-10-09 05:45 UTCEG score recompute
  13. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  14. 2026-10-08 04:52 UTCEG score recompute
  15. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  16. 2026-10-07 01:14 UTCEG score recompute
  17. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  18. 2026-10-06 03:03 UTCEG score recompute
  19. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  20. 2026-10-05 02:37 UTCEG score recompute
  21. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  22. 2026-10-03 17:29 UTCEG score recompute
  23. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  24. 2026-10-02 19:22 UTCEG score recompute
  25. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.4% · 34th percentile
Show 66 more
  1. 2026-10-01 21:24 UTCEG score recompute
  2. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  3. 2026-09-30 20:25 UTCEG score recompute
  4. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  5. 2026-09-29 15:38 UTCEG score recompute
  6. 2026-09-28 22:25 UTCEG score recompute
  7. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  8. 2026-09-28 00:25 UTCEG score recompute
  9. 2026-09-27 02:25 UTCEG score recompute
  10. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  11. 2026-09-24 19:00 UTCEG score recompute
  12. 2026-09-22 22:33 UTCEG score recompute
  13. 2026-09-22 00:28 UTCEG score recompute
  14. 2026-09-21 02:24 UTCEG score recompute
  15. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  16. 2026-09-19 17:15 UTCEG score recompute
  17. 2026-09-19 06:15 UTCEG score recompute
  18. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  19. 2026-09-17 21:16 UTCEG score recompute
  20. 2026-09-16 21:39 UTCEG score recompute
  21. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  22. 2026-09-16 09:35 UTCEG score recompute
  23. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  24. 2026-09-15 09:28 UTCEG score recompute
  25. 2026-09-14 00:29 UTCEG score recompute
  26. 2026-09-12 15:32 UTCEG score recompute
  27. 2026-09-11 17:33 UTCEG score recompute
  28. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  29. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  30. 2026-09-10 19:31 UTCEG score recompute
  31. 2026-09-09 01:45 UTCEG score recompute
  32. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  33. 2026-09-07 17:57 UTCEG score recompute
  34. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  35. 2026-09-06 19:54 UTCEG score recompute
  36. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  37. 2026-09-05 21:47 UTCEG score recompute
  38. 2026-09-05 15:31 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  39. 2026-09-04 23:48 UTCEG score recompute
  40. 2026-09-04 12:10 UTCEG score recompute
  41. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  42. 2026-09-02 16:02 UTCEG score recompute
  43. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  44. 2026-09-01 17:52 UTCEG score recompute
  45. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  46. 2026-09-01 06:51 UTCEG score recompute
  47. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  48. 2026-08-30 21:36 UTCEG score recompute
  49. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  50. 2026-08-30 10:37 UTCEG score recompute
  51. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  52. 2026-08-29 01:27 UTCEG score recompute
  53. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  54. 2026-08-27 16:27 UTCEG score recompute
  55. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  56. 2026-08-26 18:24 UTCEG score recompute
  57. 2026-08-26 18:06 UTCEG score recompute
  58. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  59. 2026-08-26 00:18 UTCEG score recompute
  60. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  61. 2026-08-24 15:18 UTCEG score recompute
  62. 2026-08-23 06:20 UTCEG score recompute
  63. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  64. 2026-08-21 21:24 UTCEG score recompute
  65. 2026-08-21 20:44 UTCEG score recomputeFirst assessed: 8.2 HIGH
  66. 2026-08-21 20:44 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-63135?
CVE-2026-63135 is a high-severity vulnerability; its CVE record was published on August 21, 2026. YOURLS is a self-hosted, customizable URL shortener written in PHP. From 1.5.1 until 1.10.4, YOURLS stores the HTTP Referer header through yourlsgetreferrer(), yourlssanitizeurlsafe(), and yourlslogredirect(), then aggregates the value in yourls-infos.php and passes the derived domain through…
When was the CVE record for CVE-2026-63135 published?
The CVE record for CVE-2026-63135 was published on August 21, 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 9, 2026; the record at its source may have been updated since.
Is CVE-2026-63135 actively exploited?
CVE-2026-63135 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (35th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-63135?
CVE-2026-63135 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-2026-63135?
A fix for CVE-2026-63135 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-63135 are linked in the Vendor Advisories panel on this page.

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