CVE-2026-50263

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-06-05. a secondary CVSS source baseline 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

A fix is available — apply it.

A use-after-free flaw was found in the X.Org X server and Xwayland in CreateSaverWindow(). A client can trigger a use-after-free read after changing window attributes and forcing the screen saver, leading to information disclosure.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
25(Track)
EG Risk 25/100SSVC: Track

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
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
4%
KEV
Not listed

Published

June 5, 2026

Last Modified

July 27, 2026

Advisory Details (5)

Auto-updated Jun 16, 2026
Patch available. Sources: redhat.
generic

Jira

https://redhat.atlassian.net/browse/PSIRTSUPT-16950
generic

X.Org Security Advisory: multiple security issues X.Org X server and Xwayland

https://lists.x.org/archives/xorg-announce/2026-June/003702.html
generic

saver: re-fetch screen private after CheckScreenPrivate in CreateSaverWindow (ecc634f1) · Commits · xorg / xserver · GitLab

https://gitlab.freedesktop.org/xorg/xserver/-/commit/ecc634f1b2f7aa473d3a267eada98c4918bf9e05
redhat

2485388 – (CVE-2026-50263) CVE-2026-50263 xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in CreateSaverWindow()

https://bugzilla.redhat.com/show_bug.cgi?id=2485388
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-50263

Vendor Advisories for CVE-2026-50263(20)

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

Patch Availability(20)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatxorg-x11-server-Xwayland-0:21.1.3-2.el8_6.72026-07-13redhat
redhatxorg-x11-server-Xwayland-0:21.1.3-13.el8_8.12026-07-13redhat
redhatxorg-x11-server-Xwayland-0:23.2.7-6.el9_6.12026-07-08redhat
redhatxorg-x11-server-Xwayland-0:21.1.3-10.el9_2.12026-07-08redhat
redhatxorg-x11-server-Xwayland-0:24.1.5-6.el10_0.12026-07-08redhat
redhatxorg-x11-server-0:1.20.11-8.el8_62026-07-08redhat
redhatxorg-x11-server-Xwayland-0:22.1.9-8.el9_4.12026-07-08redhat
redhatxorg-x11-server-0:1.20.11-19.el8_82026-07-08redhat
redhatxorg-x11-server-0:1.20.10-5.el8_42026-07-08redhat
redhatxorg-x11-server-0:1.20.11-21.el9_22026-07-07redhat
redhatxorg-x11-server-0:1.20.11-29.el9_42026-07-07redhat
redhatxorg-x11-server-0:1.20.11-34.el9_62026-07-07redhat
redhatxorg-x11-server-0:1.20.4-35.el7_92026-07-07redhat
redhattigervnc-0:1.15.0-7.el9_8.22026-06-25redhat
redhattigervnc-0:1.15.0-10.el8_102026-06-24redhat
redhatxorg-x11-server-Xwayland-0:24.1.9-4.el10_2.22026-06-22redhat
redhatxorg-x11-server-0:1.20.11-34.el9_8.22026-06-17redhat
redhatxorg-x11-server-Xwayland-0:21.1.3-20.el8_10.22026-06-17redhat
redhatxorg-x11-server-0:1.20.11-28.el8_10.22026-06-17redhat
redhatxorg-x11-server-Xwayland-0:24.1.9-4.el9_8.22026-06-17redhat

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.

Weakness Classification(1)

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

Additional Vendor Advisories

(5)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 30× in last 7d / 85× 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.

Showing the most recent 100 of 150 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-50263?
CVE-2026-50263 is a medium vulnerability published on June 5, 2026. A use-after-free flaw was found in the X.Org X server and Xwayland in CreateSaverWindow(). A client can trigger a use-after-free read after changing window attributes and forcing the screen saver, leading to information disclosure.
When was CVE-2026-50263 disclosed?
CVE-2026-50263 was first published in the National Vulnerability Database on June 5, 2026, with the most recent update on July 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-50263 actively exploited?
CVE-2026-50263 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 96.1% of all scored CVEs.
What is the CVSS score of CVE-2026-50263?
CVE-2026-50263 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-50263?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-50263, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-50263

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