CVE-2026-61520

HIGHPre-NVD 7.77.7
EchelonGraph scoreMEDIUM confidence

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

Score 7.7 from GitHub Security Advisory published 2026-07-14. The CNA's CVSS baseline 7.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: the CNA's CVSS, EPSS, GitHub Security Advisory
Trending — 3 sources updated this week
7.7EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.7Exploit: None knownExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

Simple Machines Forum 2.1 prior to commit 4bf35cf and 3.0 prior to commit b4d23df contains a server-side request forgery vulnerability in the image proxy that allows authenticated attackers to trigger internal HTTP requests by embedding attacker-controlled URLs in BBCode image tags, which the proxy fetches without validating resolved destination IPs against private address ranges, loopback, or link-local addresses. Attackers can leverage SMF's automatic HMAC signature generation for any embedded image URL to obtain valid signed proxy requests targeting internal services such as cloud instance metadata endpoints, internal web applications, and container network services.

CVSS v3
7.7
EG Score
7.7HIGHmedium confidence
EG Risk
35
EG Risk 35/100

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.
Exploitation0.4% × 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: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release.
EPSS PROB
0.4%
EPSS %ILE
36th
KEV
Not listed

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

An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release.

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 14, 2026

Last Modified

July 28, 2026

Advisory Details (3)

Auto-updated Jul 15, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
Web page

Simple Machines Forum SSRF via image proxy | Advisories | VulnCheck

https://www.vulncheck.com/advisories/simple-machines-forum-ssrf-via-image-proxy
GitHub commit

commit b4d23dfd74a5 (SimpleMachines/SMF)

Fix landed in SimpleMachines/SMF commit b4d23dfd74a5 — awaiting tagged release

https://github.com/SimpleMachines/SMF/commit/b4d23dfd74a511587c605f9d294cefc3a75b4b26
GitHub commit

commit 4bf35cf9e455 (SimpleMachines/SMF)

Fix landed in SimpleMachines/SMF commit 4bf35cf9e455 — awaiting tagged release

https://github.com/SimpleMachines/SMF/commit/4bf35cf9e45573a5f55a6f52995086c1da89c096

Vendor Advisories for CVE-2026-61520(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× 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.

Showing the most recent 100 of 220 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 120 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  2. 2026-10-13 13:25 UTCEG score recompute
  3. 2026-10-13 13:24 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  4. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  5. 2026-10-12 15:50 UTCEG score recompute
  6. 2026-10-11 19:34 UTCEG score recompute
  7. 2026-10-11 16:49 UTCEG score recompute
  8. 2026-10-11 14:11 UTCEG score recompute
  9. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  12. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  14. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  15. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  16. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  17. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  18. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  19. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  20. 2026-10-01 12:50 UTCEG score recompute
  21. 2026-10-01 12:50 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  22. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  23. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  24. 2026-09-28 08:52 UTCEG score recompute
  25. 2026-09-28 08:52 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
Show 75 more
  1. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  2. 2026-09-24 08:58 UTCEG score recompute
  3. 2026-09-24 08:58 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  4. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  5. 2026-09-23 03:26 UTCEG score recompute
  6. 2026-09-23 03:26 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  7. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  8. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  9. 2026-09-18 04:49 UTCEG score recompute
  10. 2026-09-18 04:49 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  11. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  12. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  13. 2026-09-14 11:33 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  14. 2026-09-13 23:15 UTCEG score recompute
  15. 2026-09-13 23:15 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  16. 2026-09-13 07:29 UTCEG score recompute
  17. 2026-09-13 07:29 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  18. 2026-09-12 13:07 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  19. 2026-09-11 21:52 UTCEG score recompute
  20. 2026-09-11 21:52 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  21. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  22. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  23. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  24. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  25. 2026-09-08 01:04 UTCEG score recompute
  26. 2026-09-08 01:04 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  27. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  28. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  29. 2026-09-06 13:31 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  30. 2026-09-05 20:55 UTCEG score recompute
  31. 2026-09-05 20:55 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  32. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  33. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  34. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  35. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  36. 2026-08-31 04:36 UTCEG score recompute
  37. 2026-08-31 04:36 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  38. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  39. 2026-08-30 16:22 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  40. 2026-08-30 04:08 UTCEG score recompute
  41. 2026-08-30 04:08 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  42. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  43. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  44. 2026-08-28 01:53 UTCEG score recompute
  45. 2026-08-28 01:53 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  46. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  47. 2026-08-27 12:52 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  48. 2026-08-27 00:31 UTCEG score recompute
  49. 2026-08-27 00:31 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  50. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  51. 2026-08-26 12:11 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  52. 2026-08-25 21:09 UTCEG score recompute
  53. 2026-08-25 21:09 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  54. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  55. 2026-08-25 07:52 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  56. 2026-08-24 19:38 UTCEG score recompute
  57. 2026-08-24 19:38 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  58. 2026-08-24 03:46 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  59. 2026-08-23 14:03 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  60. 2026-08-23 01:49 UTCEG score recompute
  61. 2026-08-23 01:49 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  62. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  63. 2026-08-22 13:36 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  64. 2026-08-22 01:22 UTCEG score recompute
  65. 2026-08-22 01:22 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  66. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  67. 2026-08-21 13:08 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  68. 2026-08-21 00:54 UTCEG score recompute
  69. 2026-08-21 00:54 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  70. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  71. 2026-08-20 12:37 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  72. 2026-08-20 00:24 UTCEG score recompute
  73. 2026-08-20 00:24 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7
  74. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  75. 2026-08-19 08:16 UTCGHSA enrichmentGHSA-9wvj-rhhh-8292 · GitHub CVSS 7.7

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-61520?
CVE-2026-61520 is a high-severity vulnerability; its CVE record was published on July 14, 2026. Simple Machines Forum 2.1 prior to commit 4bf35cf and 3.0 prior to commit b4d23df contains a server-side request forgery vulnerability in the image proxy that allows authenticated attackers to trigger internal HTTP requests by embedding attacker-controlled URLs in BBCode image tags, which the proxy…
When was CVE-2026-61520 made public?
CVE-2026-61520 was made public on July 14, 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 July 14, 2026. EchelonGraph's copy of the record carries a last-modified date of July 28, 2026; the record at its source may have been updated since.
Is CVE-2026-61520 actively exploited?
CVE-2026-61520 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (36th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-61520?
CVE-2026-61520 has a CVSS base score of 7.7 (the CNA's own assessment, by vulncheck; NVD's own analysis pending).
How do I remediate CVE-2026-61520?
An upstream fix for CVE-2026-61520 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-61520 are linked in the Vendor Advisories panel on this page.

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