CVE-2018-6882

CRITICALNVD 6.19.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-04-19), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 6.1 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 25%CVSS: 6.1Exploit: cisa kev · ssvc active · kev ransomware · epss top5pct · public exploitExposed: 0

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

Cross-site scripting (XSS) vulnerability in the ZmMailMsgView.getAttachmentLinkHtml function in Zimbra Collaboration Suite (ZCS) before 8.7 Patch 1 and 8.8.x before 8.8.7 might allow remote attackers to inject arbitrary web script or HTML via a Content-Location header in an email attachment.

CVSS v3
6.1
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
25%
EPSS %ILE
98%
KEV
⚠ Exploited

Published

March 27, 2018

Last Modified

August 13, 2026

Advisory Details (6)

Auto-updated Jun 13, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

Zimbra Releases/8.8.7 - Zimbra :: Tech Center

https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.7
generic

Bug Access Denied

https://bugzilla.zimbra.com/show_bug.cgi?id=108786
generic
http://www.securityfocus.com/archive/1/541891/100/0/threaded
generic

Full Disclosure: Cross-Site Scripting vulnerability in Zimbra Collaboration Suite due to the way it handles attachment links

http://seclists.org/fulldisclosure/2018/Mar/52
generic🟡 PoC Available

Cross-Site Scripting vulnerability in Zimbra Collaboration Suite due to the way it handles attachment links

https://www.securify.nl/advisory/SFY20180101/cross-site-scripting-vulnerability-in-zimbra-collaboration-suite-due-to-the-way-it-handles-attachment-links.html
generic

Zimbra Security Advisories - Zimbra :: Tech Center

https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 58× in last 7d / 252× 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 830 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Nucleihttp/cves/2018/CVE-2018-6882.yaml
    First seen Jan 1, 2018

    Zimbra Collaboration Suite - Cross-site Scripting

    Open source ↗

Frequently asked(6)

What is CVE-2018-6882?
CVE-2018-6882 is a critical vulnerability published on March 27, 2018. Cross-site scripting (XSS) vulnerability in the ZmMailMsgView.getAttachmentLinkHtml function in Zimbra Collaboration Suite (ZCS) before 8.7 Patch 1 and 8.8.x before 8.8.7 might allow remote attackers to inject arbitrary web script or HTML via a Content-Location header in an email attachment.
When was CVE-2018-6882 disclosed?
CVE-2018-6882 was first published in the National Vulnerability Database on March 27, 2018, with the most recent update on August 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-6882 actively exploited?
Yes. CISA added CVE-2018-6882 to the Known Exploited Vulnerabilities catalog on April 19, 2022, affecting Synacor Zimbra Collaboration Suite (ZCS). KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2018-6882?
CVE-2018-6882 has a CVSS v3 base score of 6.1 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2018-6882?
CVE-2018-6882 affects Synacor Zimbra Collaboration Suite (ZCS). The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2018-6882?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-6882, 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.

Dependency Blast Radius

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