CVE-2018-6882

MEDIUMNVD 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
6.1
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 24%CVSS: 6.1Exploit: NoneExposed: 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)
EPSS
97.5%
KEV
⚠ Exploited

Published

March 27, 2018

Last Modified

November 4, 2025

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 101× in last 7d / 433× 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 544 total refreshes for this CVE.

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

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 ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2018-6882?
CVE-2018-6882 is a medium 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 November 4, 2025. 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.

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