CVE-2026-79661

MEDIUMPre-NVD 6.56.5
EchelonGraph scoreMEDIUM confidence

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

Score 6.5 from GitHub Security Advisory published 2026-08-25. A secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this weekElevated
6.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (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: 0.4%CVSS: 6.5Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

Ech0 through 4.5.6 registers the PUT /api/echo/like/:id endpoint on the public router group without authentication or rate limiting. Unauthenticated attackers can increment the fav_count counter of any echo (including private echoes) by supplying its UUID, which can be harvested from the public GET /api/echo/page feed. Repeated requests are accepted without deduplication, each triggering a database write and a four-key cache invalidation, allowing attackers to inflate popularity metrics and amplify load on the database and cache. Fixed in 4.7.3.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
60
EG Risk 60/100

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)
Severity65% × 45%
The EG Score, 6.5 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
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 public PoC (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 public PoC (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

August 25, 2026

Last Modified

August 31, 2026

Advisory Details (2)

Auto-updated Aug 25, 2026
Patch available. Sources: github.
Web page

Ech0 before 4.7.3 Unauthenticated fav_count Modification | Advisories | VulnCheck

https://www.vulncheck.com/advisories/ech0-before-unauthenticated-fav-count-modification
GitHub advisoryMentions a patch (unverified)

PUT /api/echo/like/:id unauthenticated: anonymous callers modify any echo's fav_count · Advisory · lin-snow/Ech0 · GitHub

https://github.com/lin-snow/Ech0/security/advisories/GHSA-pj6q-4vq4-r8cg

Vendor Advisories for CVE-2026-79661(1)

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

Affected Packages

(2 across 1 ecosystem)
Go(2)
PackageVulnerable rangeFix by version rangeDependents
github.com/lin-snow/ech0—
  • every version up to 1.4.8-0.20260503035905-cecc2c19b590: fixed in 1.4.8-0.20260503035905-cecc2c19b590
—
github.com/lin-snow/Ech0—
  • every version up to 1.4.8-0.20260503035905-cecc2c19b590: fixed in 1.4.8-0.20260503035905-cecc2c19b590
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 76× 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 98 of 126 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. 2 repeat rows among the latest 100 are merged into the row they repeat. The 28 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 0.4% · 35th percentile
  2. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  3. 2026-10-12 14:58 UTCEG score recompute
  4. 2026-10-11 19:22 UTCEG score recompute
  5. 2026-10-11 16:38 UTCEG score recompute
  6. 2026-10-11 13:56 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. 2026-10-10 12:17 UTCEG score recompute
  10. 2026-10-10 12:17 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  12. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  13. 2026-10-08 07:27 UTCEG score recompute
  14. 2026-10-08 07:27 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  15. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  16. 2026-10-07 05:03 UTCEG score recompute
  17. 2026-10-07 05:03 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  18. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  19. 2026-10-06 02:37 UTCEG score recompute
  20. 2026-10-06 02:37 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  21. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  22. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  23. 2026-10-04 19:50 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  24. 2026-10-03 16:27 UTCEG score recompute
  25. 2026-10-03 16:27 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
Show 73 more
  1. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  2. 2026-10-02 17:57 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  3. 2026-10-02 12:53 UTCEG score recompute
  4. 2026-10-02 12:53 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  5. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  6. 2026-10-01 09:12 UTCEG score recompute
  7. 2026-10-01 09:12 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  8. 2026-09-30 06:50 UTCEG score recompute
  9. 2026-09-30 06:50 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  10. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  11. 2026-09-29 02:53 UTCEG score recompute
  12. 2026-09-29 02:53 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  13. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  14. 2026-09-28 00:30 UTCEG score recompute
  15. 2026-09-28 00:30 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  16. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  17. 2026-09-26 22:07 UTCEG score recompute
  18. 2026-09-26 22:07 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  19. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  20. 2026-09-26 00:28 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  21. 2026-09-25 15:57 UTCEG score recompute
  22. 2026-09-25 15:57 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  23. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  24. 2026-09-24 12:46 UTCEG score recompute
  25. 2026-09-24 12:46 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  26. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  27. 2026-09-23 10:23 UTCEG score recompute
  28. 2026-09-23 10:23 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  29. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  30. 2026-09-22 08:00 UTCEG score recompute
  31. 2026-09-22 08:00 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  32. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  33. 2026-09-21 05:37 UTCEG score recompute
  34. 2026-09-21 05:37 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  35. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  36. 2026-09-20 02:36 UTCEG score recompute
  37. 2026-09-20 02:36 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  38. 2026-09-19 00:14 UTCEG score recompute
  39. 2026-09-19 00:13 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  40. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  41. 2026-09-17 21:50 UTCEG score recompute
  42. 2026-09-17 21:50 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  43. 2026-09-16 19:27 UTCEG score recompute
  44. 2026-09-16 19:27 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  45. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  46. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  47. 2026-09-15 15:37 UTCEG score recompute
  48. 2026-09-15 15:37 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  49. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  50. 2026-09-14 13:09 UTCEG score recompute
  51. 2026-09-14 13:09 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  52. 2026-09-13 10:47 UTCEG score recompute
  53. 2026-09-13 10:47 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  54. 2026-09-12 08:25 UTCEG score recompute
  55. 2026-09-12 08:25 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  56. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  57. 2026-09-11 06:02 UTCEG score recompute
  58. 2026-09-11 06:02 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  59. 2026-09-10 03:39 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  60. 2026-09-09 01:16 UTCEG score recompute
  61. 2026-09-09 01:16 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  62. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  63. 2026-09-07 11:47 UTCEG score recompute
  64. 2026-09-07 11:46 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  65. 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  66. 2026-09-06 09:16 UTCEG score recompute
  67. 2026-09-06 09:16 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  68. 2026-09-05 06:44 UTCEG score recompute
  69. 2026-09-05 06:44 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  70. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  71. 2026-09-04 04:04 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5
  72. 2026-09-03 01:41 UTCEG score recompute
  73. 2026-09-03 01:41 UTCGHSA enrichmentGHSA-7xcp-744q-324g · GitHub CVSS 6.5

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Frequently asked(5)

What is CVE-2026-79661?
CVE-2026-79661 is a medium-severity vulnerability; its CVE record was published on August 25, 2026. Ech0 through 4.5.6 registers the PUT /api/echo/like/:id endpoint on the public router group without authentication or rate limiting. Unauthenticated attackers can increment the fav_count counter of any echo (including private echoes) by supplying its UUID, which can be harvested from the public GET…
When was CVE-2026-79661 made public?
CVE-2026-79661 was made public on May 3, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on August 25, 2026. EchelonGraph's copy of the record carries a last-modified date of August 31, 2026; the record at its source may have been updated since.
Is CVE-2026-79661 actively exploited?
CVE-2026-79661 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-2026-79661?
CVE-2026-79661 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-79661?
A fix for CVE-2026-79661 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-79661 are linked in the Vendor Advisories panel on this page.

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