CVE-2026-73498

HIGHPre-NVD 7.77.7
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This high-severity CVE scores 7.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (39th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated
7.7EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.7Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, confluence_upload_attachment passes its client-supplied file_path directly to open(file_path, "rb") in src/mcp_atlassian/confluence/attachments.py through _upload_attachment_direct() without calling validate_safe_path. An authenticated MCP client can read any file accessible to the server process and exfiltrate it to Confluence as an attachment. If an AI agent can be induced to call the tool through untrusted content, the same flaw can disclose server environment variables such as CONFLUENCE_API_TOKEN and other credentials. This issue is fixed in version 0.22.0.

CVSS v3
7.7
EG Score
7.7HIGHmedium confidence
EG Risk
51
EG Risk 51/100

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 (value × EchelonGraph’s weight)
Severity77% × 45%
The EG Score, 7.7 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
39th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 12, 2026

Last Modified

September 18, 2026

Advisory Details (4)

Auto-updated Aug 12, 2026
Patch available. Sources: github_pr, github_commit, github_release, github.
GitHub release Patch Available

v0.22.0

Patch available: sooperset/mcp-atlassian v0.22.0

https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0
GitHub commit Patch Available

commit b041733473f9 (sooperset/mcp-atlassian)

Patch available: sooperset/mcp-atlassian v0.22.0 (contains commit b041733473f9)

https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460
GitHub pull request Patch Available

Security hardening across attachment, transport, SSRF, authorization, filter, and OAuth layers

Patch available: sooperset/mcp-atlassian v0.22.0 (PR #1448 merged 2026-07-10)

https://github.com/sooperset/mcp-atlassian/pull/1448
GitHub advisoryMentions a patch (unverified)

Arbitrary file read via missing path validation in confluence_upload_attachment · Advisory · sooperset/mcp-atlassian · GitHub

https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-g5r6-gv6m-f5jv

Vendor Advisories for CVE-2026-73498(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
mcp-atlassian0.1.1 ... 0.9.0 (79 versions)
  • every version up to 0.22.0: fixed in 0.22.0
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 48× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 97 of 110 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 3 repeat rows among the latest 100 are merged into the row they repeat. The 13 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  2. 2026-10-13 07:53 UTCEG score recompute
  3. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  4. 2026-10-12 15:40 UTCEG score recompute
  5. 2026-10-11 19:26 UTCEG score recompute
  6. 2026-10-11 16:42 UTCEG score recompute
  7. 2026-10-11 14:01 UTCEG score recompute
  8. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  9. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  10. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  11. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  12. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  13. 2026-10-07 02:27 UTCEG score recompute
  14. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  15. 2026-10-06 14:06 UTCEG score recompute
  16. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  17. 2026-10-05 14:43 UTCEG score recompute
  18. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  19. 2026-10-03 19:55 UTCEG score recompute
  20. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  21. 2026-10-02 21:57 UTCEG score recompute
  22. 2026-10-02 08:17 UTCEG score recompute
  23. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  24. 2026-09-30 21:52 UTCEG score recompute
  25. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.5% · 39th percentile
Show 72 more
  1. 2026-09-29 04:24 UTCEG score recompute
  2. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  3. 2026-09-28 01:11 UTCEG score recompute
  4. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  5. 2026-09-27 09:51 UTCEG score recompute
  6. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  7. 2026-09-25 03:38 UTCEG score recompute
  8. 2026-09-24 04:09 UTCEG score recompute
  9. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  10. 2026-09-23 03:18 UTCEG score recompute
  11. 2026-09-22 02:33 UTCEG score recompute
  12. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  13. 2026-09-21 01:49 UTCEG score recompute
  14. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  15. 2026-09-19 23:43 UTCEG score recompute
  16. 2026-09-18 20:35 UTCEG score recompute
  17. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  18. 2026-09-18 02:04 UTCEG score recompute
  19. 2026-09-17 00:15 UTCEG score recompute
  20. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  21. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  22. 2026-09-15 13:07 UTCEG score recompute
  23. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  24. 2026-09-13 20:56 UTCEG score recompute
  25. 2026-09-12 20:15 UTCEG score recompute
  26. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  27. 2026-09-11 19:22 UTCEG score recompute
  28. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  29. 2026-09-10 18:40 UTCEG score recompute
  30. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  31. 2026-09-09 05:10 UTCEG score recompute
  32. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  33. 2026-09-07 18:09 UTCEG score recompute
  34. 2026-09-06 15:26 UTCEG score recompute
  35. 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  36. 2026-09-06 02:46 UTCEG score recompute
  37. 2026-09-05 02:04 UTCEG score recompute
  38. 2026-09-04 13:43 UTCEG score recompute
  39. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  40. 2026-09-02 23:24 UTCEG score recompute
  41. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  42. 2026-09-01 23:58 UTCEG score recompute
  43. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  44. 2026-09-01 11:38 UTCEG score recompute
  45. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  46. 2026-08-30 21:32 UTCEG score recompute
  47. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  48. 2026-08-30 09:11 UTCEG score recompute
  49. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  50. 2026-08-29 08:27 UTCEG score recompute
  51. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  52. 2026-08-28 00:51 UTCEG score recompute
  53. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  54. 2026-08-26 23:59 UTCEG score recompute
  55. 2026-08-26 14:47 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  56. 2026-08-25 23:16 UTCEG score recompute
  57. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  58. 2026-08-24 22:10 UTCEG score recompute
  59. 2026-08-24 09:50 UTCEG score recompute
  60. 2026-08-23 09:08 UTCEG score recompute
  61. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  62. 2026-08-22 08:26 UTCEG score recompute
  63. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  64. 2026-08-21 07:44 UTCEG score recompute
  65. 2026-08-20 22:56 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  66. 2026-08-19 18:42 UTCEG score recompute
  67. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  68. 2026-08-18 17:50 UTCEG score recompute
  69. 2026-08-18 13:49 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  70. 2026-08-17 17:09 UTCEG score recompute
  71. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  72. 2026-08-16 16:27 UTCEG score recompute

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-73498?
CVE-2026-73498 is a high-severity vulnerability; its CVE record was published on August 12, 2026. MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, confluenceuploadattachment passes its client-supplied filepath directly to open(filepath, "rb") in src/mcpatlassian/confluence/attachments.py through uploadattachmentdirect()…
When was the CVE record for CVE-2026-73498 published?
The CVE record for CVE-2026-73498 was published on August 12, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 18, 2026; the record at its source may have been updated since.
Is CVE-2026-73498 actively exploited?
CVE-2026-73498 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (39th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-73498?
CVE-2026-73498 has a CVSS base score of 7.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-73498?
A fix for CVE-2026-73498 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-73498 are linked in the Vendor Advisories panel on this page.

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