CVE-2026-78997

CRITICALPre-NVD 9.39.3—
EchelonGraph scoreHIGH confidence

Score 9.3 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-08. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
9.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.3Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

UC Browser for Android (package com.UCMobile.intl, version 13.7.8.1314) contains a Universal Cross-Site Scripting vulnerability that allows an attacker to execute arbitrary JavaScript in the context of any origin. An attacker hosts a specially crafted URL on a UC-owned domain (via a reflected XSS) that leverages the browser's internal JavaScript bridge to register a deferred callback, navigate the tab to a victim site, and then execute attacker-controlled code on that site when a login dialog is dismissed.

CVSS v3
9.3
EG Score
9.3(high)
EG Risk
58(Track*)
EG Risk 58/100SSVC: 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
Severity93% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
31%
KEV
Not listed

Published

September 8, 2026

Last Modified

September 9, 2026

Advisory Details (2)

Auto-updated Sep 23, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

ucbrowser-uxss.md · GitHub

https://gist.github.com/OmriInbar-Novee/9fd65fe08c1b1cff6a19350e44425de2
generic

CVE-2026-78997 · GitHub

https://gist.github.com/OmriInbar-Novee/ef7a92db148b2eb1ab0aa7b99a565c4c

Vendor Advisories for CVE-2026-78997(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 54× in last 7d / 128× 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 128 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-78997?
CVE-2026-78997 is a critical vulnerability published on September 8, 2026. UC Browser for Android (package com.UCMobile.intl, version 13.7.8.1314) contains a Universal Cross-Site Scripting vulnerability that allows an attacker to execute arbitrary JavaScript in the context of any origin. An attacker hosts a specially crafted URL on a UC-owned domain (via a reflected XSS)…
When was CVE-2026-78997 disclosed?
CVE-2026-78997 was first published in the National Vulnerability Database on September 8, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-78997 actively exploited?
CVE-2026-78997 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 68.7% of all scored CVEs.
What is the CVSS score of CVE-2026-78997?
CVE-2026-78997 has a CVSS v3.1 base score of 9.3 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-78997?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-78997, 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.

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