CVE-2023-33186

HIGHNVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.2 under NVD CVSS v3. EPSS exploit probability: 0.6%, top 54% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.2Exploit: None knownExposed: 0

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

Zulip is an open-source team collaboration tool with unique topic-based threading that combines the best of email and chat to make remote work productive and delightful. The main development branch of Zulip Server from May 2, 2023 and later, including beta versions 7.0-beta1 and 7.0-beta2, is vulnerable to a cross-site scripting vulnerability in tooltips on the message feed. An attacker who can send messages could maliciously craft a topic for the message, such that a victim who hovers the tooltip for that topic in their message feed triggers execution of JavaScript code controlled by the attacker.

CVSS v3
8.2
EG Score
8.2(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity82% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
47%
KEV
Not listed

Published

May 30, 2023

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated Sep 8, 2026
Patch available. Sources: github, github_commit, github_pr.
github Patch Available

Cross-site scripting vulnerability in Zulip Server development branch via topic tooltip · Advisory · zulip/zulip · GitHub

https://github.com/zulip/zulip/security/advisories/GHSA-4r83-8f94-hrph
github_pr Patch Available

tooltips: Add `S` hotkey hint to `narrow-to` tippy tooltips.

Patch available: zulip/zulip 8.3 (PR #25370 merged 2023-05-02)

https://github.com/zulip/zulip/pull/25370
github_commit Patch Available

commit 3ca131743b00 (zulip/zulip)

Patch available: zulip/zulip 8.3 (contains commit 3ca131743b00)

https://github.com/zulip/zulip/commit/3ca131743b00f42bad8edbac4ef92656d954c629
github_commit Patch Available

commit 03cfb3d9fe61 (zulip/zulip)

Patch available: zulip/zulip 8.3 (contains commit 03cfb3d9fe61)

https://github.com/zulip/zulip/commit/03cfb3d9fe61c975d133121ec31a7357f0c9e18f

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 28× 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 163 total refreshes for this CVE.

  1. 2026-09-07 15:59 UTCEPSS rescore
  2. 2026-09-06 13:45 UTCEPSS rescore
  3. 2026-09-05 15:26 UTCEPSS rescore
  4. 2026-09-04 13:58 UTCEPSS rescore
  5. 2026-09-04 05:46 UTCOSV refresh
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  21. 2026-08-17 16:29 UTCOSV refresh
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  1. 2026-08-13 21:58 UTCEPSS rescore
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  5. 2026-08-08 16:34 UTCEPSS rescore
  6. 2026-08-07 16:24 UTCEPSS rescore
  7. 2026-08-06 13:44 UTCEPSS rescore
  8. 2026-08-05 19:15 UTCEPSS rescore
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  10. 2026-08-04 15:07 UTCEPSS rescore
  11. 2026-08-04 10:35 UTCEPSS rescore
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  13. 2026-08-02 11:57 UTCOSV refresh
  14. 2026-08-02 02:25 UTCEPSS rescore
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  20. 2026-07-28 15:34 UTCEPSS rescore
  21. 2026-07-27 14:10 UTCEPSS rescore
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  23. 2026-07-25 14:16 UTCEPSS rescore
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  25. 2026-07-23 14:16 UTCEPSS rescore
  26. 2026-07-23 14:16 UTCEPSS rescore
  27. 2026-07-23 02:23 UTCEG score recompute
  28. 2026-07-22 23:10 UTCEG score recompute
  29. 2026-07-22 14:06 UTCEPSS rescore
  30. 2026-07-21 15:23 UTCEPSS rescore
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  32. 2026-07-20 17:06 UTCEPSS rescore
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  39. 2026-07-16 17:01 UTCEPSS rescore
  40. 2026-07-15 19:23 UTCOSV refresh
  41. 2026-07-15 16:56 UTCEPSS rescore
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  43. 2026-07-15 01:58 UTCEPSS rescore
  44. 2026-07-15 01:58 UTCEPSS rescore
  45. 2026-07-13 22:28 UTCEPSS rescore
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  47. 2026-07-13 06:11 UTCEPSS rescore
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  49. 2026-07-12 05:45 UTCEPSS rescore
  50. 2026-07-11 08:26 UTCEPSS rescore
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  52. 2026-07-09 19:08 UTCEPSS rescore
  53. 2026-07-09 19:08 UTCEPSS rescore
  54. 2026-07-08 15:13 UTCEPSS rescore
  55. 2026-07-07 13:44 UTCEPSS rescore
  56. 2026-07-06 16:26 UTCEPSS rescore
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  58. 2026-07-06 02:21 UTCEPSS rescore
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  61. 2026-07-02 16:59 UTCEPSS rescore
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  63. 2026-06-30 23:21 UTCEPSS rescore
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  65. 2026-06-29 14:05 UTCEPSS rescore
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  69. 2026-06-28 04:55 UTCEPSS rescore
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  71. 2026-06-27 20:04 UTCOSV refresh
  72. 2026-06-27 03:07 UTCEPSS rescore
  73. 2026-06-27 03:07 UTCEPSS rescore
  74. 2026-06-25 13:48 UTCEPSS rescore
  75. 2026-06-25 13:48 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2023-33186?
CVE-2023-33186 is a high vulnerability published on May 30, 2023. Zulip is an open-source team collaboration tool with unique topic-based threading that combines the best of email and chat to make remote work productive and delightful. The main development branch of Zulip Server from May 2, 2023 and later, including beta versions 7.0-beta1 and 7.0-beta2, is…
When was CVE-2023-33186 disclosed?
CVE-2023-33186 was first published in the National Vulnerability Database on May 30, 2023, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-33186 actively exploited?
CVE-2023-33186 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 52.6% of all scored CVEs.
What is the CVSS score of CVE-2023-33186?
CVE-2023-33186 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2023-33186?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-33186, 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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