CVE-2026-47733

MEDIUMPre-NVD 4.44.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1%, top 98% 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, secondary
4.4
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.4Exploit: NoneExposed: 0

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

Rocket.Chat is an open-source, secure, fully customizable communications platform. Prior to 8.5.0, the ImageElement component in packages/gazzodown renders user-controlled src values directly into and attributes without protocol sanitization. Unlike the analogous LinkSpan component — which uses sanitizeUrl to block javascript:, data:, and vbscript: protocols — ImageElement passes the raw URL through unchanged. An authenticated user can post a markdown image with a javascript: URL that, if clicked on an older browser, would execute arbitrary JavaScript in the viewer's session. This vulnerability is fixed in 8.5.0.

CVSS v3
4.4
EG Score
4.4(medium)
EPSS
2.0%
KEV
Not listed

Published

June 24, 2026

Last Modified

June 25, 2026

Advisory Details (1)

Auto-updated Jun 24, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Missing URL protocol sanitization in ImageElement allows javascript: URLs in markdown images · Advisory · RocketChat/Rocket.Chat · GitHub

https://github.com/RocketChat/Rocket.Chat/security/advisories/GHSA-vvrf-fq54-q4pr

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 37× 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.

  1. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 09:04 UTCEG score recompute
  3. 2026-07-14 07:10 UTCEG score recompute
  4. 2026-07-13 22:30 UTCEPSS rescore
  5. 2026-07-13 06:13 UTCEPSS rescore
  6. 2026-07-13 05:22 UTCEG score recompute
  7. 2026-07-12 05:46 UTCEPSS rescore
  8. 2026-07-12 03:28 UTCEG score recompute
  9. 2026-07-11 01:40 UTCEG score recompute
  10. 2026-07-09 23:45 UTCEG score recompute
  11. 2026-07-09 19:10 UTCEPSS rescore
  12. 2026-07-08 21:57 UTCEG score recompute
  13. 2026-07-08 15:16 UTCEPSS rescore
  14. 2026-07-07 20:08 UTCEG score recompute
  15. 2026-07-07 13:46 UTCEPSS rescore
  16. 2026-07-06 18:21 UTCEG score recompute
  17. 2026-07-06 16:27 UTCEPSS rescore
  18. 2026-07-06 02:23 UTCEPSS rescore
  19. 2026-07-05 16:32 UTCEG score recompute
  20. 2026-07-05 02:30 UTCEPSS rescore
  21. 2026-07-04 14:36 UTCEG score recompute
  22. 2026-07-04 06:31 UTCEPSS rescore
  23. 2026-07-03 12:49 UTCEG score recompute
  24. 2026-07-02 11:00 UTCEG score recompute
  25. 2026-07-01 15:07 UTCEPSS rescore
Show 12 more
  1. 2026-07-01 08:51 UTCEG score recompute
  2. 2026-06-30 23:22 UTCEPSS rescore
  3. 2026-06-30 07:03 UTCEG score recompute
  4. 2026-06-29 05:15 UTCEG score recompute
  5. 2026-06-28 14:07 UTCEPSS rescore
  6. 2026-06-28 03:27 UTCEG score recompute
  7. 2026-06-27 03:08 UTCEPSS rescore
  8. 2026-06-27 01:39 UTCEG score recompute
  9. 2026-06-25 23:52 UTCEG score recompute
  10. 2026-06-25 13:49 UTCEPSS rescore
  11. 2026-06-24 22:04 UTCEG score recompute
  12. 2026-06-24 22:03 UTCNVD updatefirst tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-47733?
CVE-2026-47733 is a medium vulnerability published on June 24, 2026. Rocket.Chat is an open-source, secure, fully customizable communications platform. Prior to 8.5.0, the ImageElement component in packages/gazzodown renders user-controlled src values directly into <a href> and <img src> attributes without protocol sanitization. Unlike the analogous LinkSpan…
When was CVE-2026-47733 disclosed?
CVE-2026-47733 was first published in the National Vulnerability Database on June 24, 2026, with the most recent update on June 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-47733 actively exploited?
CVE-2026-47733 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-47733?
CVE-2026-47733 has a CVSS v3 base score of 4.4 (NVD).
How do I remediate CVE-2026-47733?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-47733, 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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