CVE-2026-52821

MEDIUMPre-NVD 5.35.3
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (35th 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
5.3EG
EchelonGraph verdictMonitorRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 5.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Kimai is an open-source time tracking application. Prior to 2.57.0, GET or POST requests to /en/admin/activity/create/{project} and /en/admin/project/create/{customer} require only the generic create_activity or create_project capability and do not verify edit access to the supplied Project or Customer object. A user who knows a valid project.id or customer identifier can use the preset-parent creation logic in src/Controller/ActivityController.php or src/Controller/ProjectController.php to persist a new child business object under an unauthorized parent, polluting project or customer configuration and influencing later time-entry, rate, reporting, and billing behavior. This issue is fixed in version 2.57.0.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100

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)
Severity53% × 45%
The EG Score, 5.3 of 10.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
35th
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (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)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (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

July 14, 2026

Last Modified

September 30, 2026

Advisory Details (4)

Auto-updated Sep 15, 2026
Patch available. Sources: github, github_pr, github_release.
Web page

Users could create activities and projects outside their access scope – Kimai

https://www.kimai.org/en/security/ghsa-3q6q-26vg-v97x
GitHub release Patch Available

2.57.0

Patch available: kimai/kimai 2.57.0

https://github.com/kimai/kimai/releases/tag/2.57.0
GitHub pull request Patch Available

Release 2.57

Patch available: kimai/kimai 2.57.0 (PR #5929 merged 2026-05-21)

https://github.com/kimai/kimai/pull/5929
GitHub advisoryMentions a patch (unverified)

Improper Authorization in Kimai Activity Creation with Preset Project Allows Creation Under Unauthorized Projects · Advisory · kimai/kimai · GitHub

https://github.com/kimai/kimai/security/advisories/GHSA-3q6q-26vg-v97x

Vendor Advisories for CVE-2026-52821(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)
Packagist(1)
PackageVulnerable rangeFix by version rangeDependents
kimai/kimai0.1 ... 2.9.0 (202 versions)
  • every version up to 2.57.0: fixed in 2.57.0
—

Weakness Classification(2)

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 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.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  3. 2026-10-12 15:58 UTCEG score recompute
  4. 2026-10-11 19:41 UTCEG score recompute
  5. 2026-10-11 16:56 UTCEG score recompute
  6. 2026-10-11 14:19 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  15. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  16. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  17. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  18. 2026-09-30 18:11 UTCEG score recompute
  19. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  20. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  21. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  22. 2026-09-28 09:26 UTCEG score recompute
  23. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  24. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  25. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.4% · 34th percentile
Show 16 more
  1. 2026-09-24 09:58 UTCEG score recompute
  2. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  3. 2026-09-23 04:16 UTCEG score recompute
  4. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  5. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  6. 2026-09-17 15:30 UTCEG score recompute
  7. 2026-09-17 14:35 UTCEG score recompute
  8. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  9. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  10. 2026-09-15 11:29 UTCEG score recompute
  11. 2026-09-15 10:50 UTCEG score recomputeFirst assessed: 5.3 MEDIUM
  12. 2026-09-15 10:47 UTCMITRE cvelistV5CVSS v3 → 5.3 · CVSS v4 → 5.3
  13. 2026-08-01 04:56 UTCEG score recompute
  14. 2026-07-26 11:50 UTCEG score recompute
  15. 2026-07-23 03:19 UTCEG score recompute
  16. 2026-07-14 00:09 UTCEG score recompute

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-52821?
CVE-2026-52821 is a medium-severity vulnerability; its CVE record was published on July 14, 2026. Kimai is an open-source time tracking application. Prior to 2.57.0, GET or POST requests to /en/admin/activity/create/{project} and /en/admin/project/create/{customer} require only the generic createactivity or createproject capability and do not verify edit access to the supplied Project or…
When was the CVE record for CVE-2026-52821 published?
The CVE record for CVE-2026-52821 was published on July 14, 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 30, 2026; the record at its source may have been updated since.
Is CVE-2026-52821 actively exploited?
CVE-2026-52821 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (35th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-52821?
CVE-2026-52821 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-52821?
A fix for CVE-2026-52821 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-52821 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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