CVE-2026-58500

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% (32nd 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.

MCP Appium is an MCP server that provides AI assistants with tools to automate mobile app testing on Android and iOS. In versions prior to 1.85.10, the createLocatorGeneratorUI function interpolates attacker-controlled element attributes — text, content-desc, resource-id, and locator selector values — directly into an HTML template literal without any HTML or JavaScript context escaping. An attacker who controls the UI of the app under test can inject arbitrary HTML and JavaScript into the MCP UI resource returned by the generate_locators tool. When a victim's MCP client renders this resource, the injected script executes and can invoke arbitrary MCP tools via window.parent.postMessage, leading to unauthorized MCP tool execution such as taking screenshots, reading page source, or any other registered capability. This issue has been fixed in version 1.85.10.

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
32nd
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 13, 2026

Last Modified

August 26, 2026

Advisory Details (2)

Auto-updated Jul 13, 2026
Patch available. Sources: github_commit, github.
GitHub commit Patch Available

commit e222bbbd6fe2 (appium/appium-mcp)

Patch available: appium/appium-mcp v1.85.10 (contains commit e222bbbd6fe2)

https://github.com/appium/appium-mcp/commit/e222bbbd6fe2b656a320efcd143563f08061a83d
GitHub advisoryMentions a patch (unverified)

Unescaped Locator Data XSS in MCP-UI Resource (createLocatorGeneratorUI) · Advisory · appium/appium-mcp · GitHub

https://github.com/appium/appium-mcp/security/advisories/GHSA-x975-rgx4-5fh4

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
appium-mcp—
  • every version up to 1.85.10: fixed in 1.85.10
—

Weakness Classification(1)

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 138 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 38 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 0.4% · 32nd percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  3. 2026-10-12 15:53 UTCEG score recompute
  4. 2026-10-11 19:36 UTCEG score recompute
  5. 2026-10-11 16:51 UTCEG score recompute
  6. 2026-10-11 14:14 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  10. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  15. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  16. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  17. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  18. 2026-10-01 14:11 UTCEG score recompute
  19. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  20. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  21. 2026-09-28 09:29 UTCEG score recompute
  22. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  23. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  24. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  25. 2026-09-24 10:04 UTCEG score recompute
Show 75 more
  1. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 28th percentile
  2. 2026-09-23 04:18 UTCEG score recompute
  3. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 28th percentile
  4. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 28th percentile
  5. 2026-09-18 05:01 UTCEG score recompute
  6. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.3% · 28th percentile
  7. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  8. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  9. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  10. 2026-09-13 23:31 UTCEG score recompute
  11. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  12. 2026-09-13 07:58 UTCEG score recompute
  13. 2026-09-12 01:50 UTCEG score recompute
  14. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  15. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  16. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  17. 2026-09-08 01:54 UTCEG score recompute
  18. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  19. 2026-09-06 13:49 UTCEG score recompute
  20. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  21. 2026-09-05 21:23 UTCEG score recompute
  22. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  23. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  24. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  25. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  26. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  27. 2026-08-30 05:28 UTCEG score recompute
  28. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  29. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  30. 2026-08-28 02:52 UTCEG score recompute
  31. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  32. 2026-08-26 19:42 UTCEG score recompute
  33. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  34. 2026-08-26 02:20 UTCEG score recompute
  35. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  36. 2026-08-24 22:11 UTCEG score recompute
  37. 2026-08-23 07:28 UTCEG score recompute
  38. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  39. 2026-08-22 05:35 UTCEG score recompute
  40. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  41. 2026-08-21 03:36 UTCEG score recompute
  42. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  43. 2026-08-20 01:10 UTCEG score recompute
  44. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  45. 2026-08-18 20:26 UTCEG score recompute
  46. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  47. 2026-08-17 15:54 UTCEG score recompute
  48. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  49. 2026-08-17 03:00 UTCEG score recompute
  50. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  51. 2026-08-16 14:06 UTCEG score recompute
  52. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  53. 2026-08-15 12:18 UTCEG score recompute
  54. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  55. 2026-08-14 10:31 UTCEG score recompute
  56. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  57. 2026-08-12 19:50 UTCEG score recompute
  58. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  59. 2026-08-11 18:02 UTCEG score recompute
  60. 2026-08-11 05:06 UTCEG score recompute
  61. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  62. 2026-08-09 14:21 UTCEG score recompute
  63. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  64. 2026-08-09 01:28 UTCEG score recompute
  65. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  66. 2026-08-07 23:40 UTCEG score recompute
  67. 2026-08-06 21:53 UTCEG score recompute
  68. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  69. 2026-08-05 20:05 UTCEG score recompute
  70. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  71. 2026-08-04 18:17 UTCEG score recompute
  72. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  73. 2026-08-04 10:39 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  74. 2026-08-03 16:29 UTCEG score recompute
  75. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.3% · 19th percentile

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-58500?
CVE-2026-58500 is a high-severity vulnerability; its CVE record was published on July 13, 2026. MCP Appium is an MCP server that provides AI assistants with tools to automate mobile app testing on Android and iOS. In versions prior to 1.85.10, the createLocatorGeneratorUI function interpolates attacker-controlled element attributes — text, content-desc, resource-id, and locator selector…
When was the CVE record for CVE-2026-58500 published?
The CVE record for CVE-2026-58500 was published on July 13, 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 August 26, 2026; the record at its source may have been updated since.
Is CVE-2026-58500 actively exploited?
CVE-2026-58500 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (32nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-58500?
CVE-2026-58500 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-2026-58500?
A fix for CVE-2026-58500 is available: update to the fixed version the vendor names in its advisory.

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