CVE-2026-57858

HIGHPre-NVD 8.98.9—
EchelonGraph scoreMEDIUM confidence

Score 8.9 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-12. The CNA's CVSS baseline 8.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this weekElevated
8.9EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.9Exploit: Elevated riskExposed services: Not assessed

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

Cal.com Cal.diy versions 2.1.1 through 6.2.0 contain a stored cross-site scripting vulnerability in the BookingPageTagManager component that allows authenticated event owners to inject arbitrary JavaScript by supplying a malicious analytics tracking ID without sanitization. Attackers can close the inline script string literal with a crafted payload that executes in the browser of every visitor to the affected public booking page, enabling session cookie theft, forged authenticated requests, and wormable propagation by chaining with CSRF-able endpoints to persist payloads on additional events.

CVSS v3
8.9
EG Score
8.9HIGHmedium confidence
EG Risk
56
EG Risk 56/100CISA SSVC

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
Severity89% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.4%
EPSS %ILE
28th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 12, 2026

Last Modified

October 1, 2026

Advisory Details (3)

Auto-updated Aug 12, 2026
No fix on record yet.
generic

Cal.com Cal.diy 6.2.0 Stored XSS via BookingPageTagManager Analytics Tracking ID | Advisories | VulnCheck

https://www.vulncheck.com/advisories/cal-com-cal-diy-stored-xss-via-bookingpagetagmanager-analytics-tracking-id
generic

cve-2026-57858: cal.com declines to address stored xss in self-hosted version · ashton richards

https://ashtonr.com/blog/cve-2026-57858/
generic

GitHub - calcom/cal.diy: Scheduling infrastructure for absolutely everyone. · GitHub

https://github.com/calcom/cal.com

Vendor Advisories for CVE-2026-57858(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 14× in last 7d / 91× 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 204 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-57858?
CVE-2026-57858 is a high vulnerability published on August 12, 2026. Cal.com Cal.diy versions 2.1.1 through 6.2.0 contain a stored cross-site scripting vulnerability in the BookingPageTagManager component that allows authenticated event owners to inject arbitrary JavaScript by supplying a malicious analytics tracking ID without sanitization. Attackers can close the…
When was CVE-2026-57858 disclosed?
CVE-2026-57858 was first published on August 12, 2026, with the most recent update on October 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-57858 actively exploited?
CVE-2026-57858 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (28th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-57858?
CVE-2026-57858 has a CVSS base score of 8.9 (the CNA's own assessment, by vulncheck; NVD's own analysis pending).
How do I remediate CVE-2026-57858?
No fix for CVE-2026-57858 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-57858 are linked in the Vendor Advisories panel on this page.

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