CVE-2026-21723

MEDIUMPre-NVD 5.35.3
EchelonGraph scoreMEDIUM confidence

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

Score 5.3 from GitHub Security Advisory published 2026-07-23. A secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 4 sources updated this week

Also known asEUVD-2026-47869 (ENISA EUVD) · GHSA-xcrm-48rh-35pj (GitHub Security Advisories)Source: ENISA EUVD

5.3EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

The alertmanager templates test endpoint (/api/alertmanager/grafana/config/api/v1/templates/test) can execute templates with no memory limits. Mass-executing templates in a short period causes OOM and crashes the Grafana service. The endpoint requires very low privileges and is exploitable with anonymous access enabled.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
24
EG Risk 24/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity53% × 45%
Impact severity (EG Severity): CVSS 5.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (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
0.2%
EPSS %ILE
11th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (5.3): severity, escalated by confirmed exploitation. This CVE's 5.3 is its impact severity (EG Severity), not escalated.

EG Severity
5.3 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

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

Exploitation none (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

July 23, 2026

Last Modified

October 24, 2026

Advisory Details (1)

Auto-updated Jul 26, 2026
Patch available.
Web page

DoS Vulnerability in Templates Test endpoint | Grafana Labs

https://grafana.com/security/security-advisories/cve-2026-21723

Vendor Advisories for CVE-2026-21723(4)

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

Patch Availability(3)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatgrafana12-4-main-12.4.10-0.1.hum12026-09-08redhat
redhatgrafana13-2-main-13.2.1-0.1.hum12026-09-03redhat
redhatgrafana13-1-main-13.1.3-0.5.hum12026-09-03redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 49× 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 100 of 226 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. None are among the latest 100 rows. The 126 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  2. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  3. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  4. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  5. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  6. 2026-10-25 14:42 UTCEG score recompute
  7. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  8. 2026-10-24 13:34 UTCEG score recompute
  9. 2026-10-24 13:34 UTCVendor advisory
  10. 2026-10-24 13:34 UTCGHSA enrichmentGHSA-xcrm-48rh-35pj · GitHub CVSS 5.3
  11. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  12. 2026-10-23 05:43 UTCEG score recompute
  13. 2026-10-23 05:43 UTCVendor advisory
  14. 2026-10-23 05:43 UTCGHSA enrichmentGHSA-xcrm-48rh-35pj · GitHub CVSS 5.3
  15. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  16. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  17. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  18. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  19. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  20. 2026-10-18 03:56 UTCEG score recompute
  21. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  22. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  23. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  24. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  25. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.3% · 24th percentile
Show 75 more
  1. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  2. 2026-10-12 16:22 UTCEG score recompute
  3. 2026-10-11 20:04 UTCEG score recompute
  4. 2026-10-11 17:17 UTCEG score recompute
  5. 2026-10-11 14:49 UTCEG score recompute
  6. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  7. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  8. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  9. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  10. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  11. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  12. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  13. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  14. 2026-10-04 12:45 UTCEG score recompute
  15. 2026-10-04 12:45 UTCVendor advisory
  16. 2026-10-04 12:45 UTCGHSA enrichmentGHSA-xcrm-48rh-35pj · GitHub CVSS 5.3
  17. 2026-10-03 03:30 UTCEG score recompute
  18. 2026-10-03 03:30 UTCVendor advisory
  19. 2026-10-03 03:30 UTCGHSA enrichmentGHSA-xcrm-48rh-35pj · GitHub CVSS 5.3
  20. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  21. 2026-10-01 06:25 UTCEG score recompute
  22. 2026-10-01 06:25 UTCVendor advisory
  23. 2026-10-01 06:25 UTCGHSA enrichmentGHSA-xcrm-48rh-35pj · GitHub CVSS 5.3
  24. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  25. 2026-09-29 15:21 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  26. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  27. 2026-09-28 05:13 UTCEG score recompute
  28. 2026-09-28 05:13 UTCVendor advisory
  29. 2026-09-28 05:13 UTCGHSA enrichmentGHSA-xcrm-48rh-35pj · GitHub CVSS 5.3
  30. 2026-09-27 13:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  31. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  32. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  33. 2026-09-24 14:03 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  34. 2026-09-24 01:30 UTCEG score recompute
  35. 2026-09-24 01:30 UTCVendor advisory
  36. 2026-09-24 01:30 UTCGHSA enrichmentGHSA-xcrm-48rh-35pj · GitHub CVSS 5.3
  37. 2026-09-22 22:59 UTCEG score recompute
  38. 2026-09-22 22:59 UTCVendor advisory
  39. 2026-09-22 22:59 UTCGHSA enrichmentGHSA-xcrm-48rh-35pj · GitHub CVSS 5.3
  40. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  41. 2026-09-20 01:58 UTCEG score recompute
  42. 2026-09-20 01:58 UTCVendor advisory
  43. 2026-09-20 01:58 UTCGHSA enrichmentGHSA-xcrm-48rh-35pj · GitHub CVSS 5.3
  44. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  45. 2026-09-18 10:26 UTCEG score recompute
  46. 2026-09-18 10:26 UTCVendor advisory
  47. 2026-09-18 10:26 UTCGHSA enrichmentGHSA-xcrm-48rh-35pj · GitHub CVSS 5.3
  48. 2026-09-17 09:35 UTCEG score recompute
  49. 2026-09-17 09:35 UTCVendor advisory
  50. 2026-09-17 09:35 UTCGHSA enrichmentGHSA-xcrm-48rh-35pj · GitHub CVSS 5.3
  51. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  52. 2026-09-16 06:55 UTCEG score recompute
  53. 2026-09-16 06:55 UTCVendor advisory
  54. 2026-09-16 06:55 UTCGHSA enrichmentGHSA-xcrm-48rh-35pj · GitHub CVSS 5.3
  55. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  56. 2026-09-14 02:10 UTCEG score recompute
  57. 2026-09-14 02:10 UTCVendor advisory
  58. 2026-09-14 02:10 UTCGHSA enrichmentGHSA-xcrm-48rh-35pj · GitHub CVSS 5.3
  59. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  60. 2026-09-13 01:21 UTCEG score recompute
  61. 2026-09-13 01:21 UTCVendor advisory
  62. 2026-09-13 01:21 UTCGHSA enrichmentGHSA-xcrm-48rh-35pj · GitHub CVSS 5.3
  63. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  64. 2026-09-11 22:06 UTCEG score recompute
  65. 2026-09-11 22:06 UTCVendor advisory
  66. 2026-09-11 22:06 UTCGHSA enrichmentGHSA-xcrm-48rh-35pj · GitHub CVSS 5.3
  67. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  68. 2026-09-10 21:12 UTCEG score recompute
  69. 2026-09-10 21:12 UTCVendor advisory
  70. 2026-09-10 21:12 UTCGHSA enrichmentGHSA-xcrm-48rh-35pj · GitHub CVSS 5.3
  71. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  72. 2026-09-09 09:10 UTCEG score recompute
  73. 2026-09-09 09:10 UTCVendor advisory
  74. 2026-09-09 09:10 UTCGHSA enrichmentGHSA-xcrm-48rh-35pj · GitHub CVSS 5.3
  75. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 25th percentile

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Frequently asked(5)

What is CVE-2026-21723?
CVE-2026-21723 is a medium-severity vulnerability; its CVE record was published on July 23, 2026. The alertmanager templates test endpoint (/api/alertmanager/grafana/config/api/v1/templates/test) can execute templates with no memory limits. Mass-executing templates in a short period causes OOM and crashes the Grafana service. The endpoint requires very low privileges and is exploitable with…
When was CVE-2026-21723 made public?
CVE-2026-21723 was made public on July 22, 2026: that is the date its CVE record's CNA, Grafana Labs, gives for when the vulnerability was made public. The CVE record itself was published on July 23, 2026. EchelonGraph's copy of the record carries a last-modified date of October 24, 2026; the record at its source may have been updated since.
Is CVE-2026-21723 actively exploited?
CVE-2026-21723 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (11th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-21723?
CVE-2026-21723 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-2026-21723?
A fix for CVE-2026-21723 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-21723 are linked in the Vendor Advisories panel on this page.

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